Simple Servlet Program For Database Connection PoolingA Simple Servlet Example – (write, deploy, run) By mkyong | December. deploy and run a simple servlet in web container. \Program Files\Java\j2ee\lib\javaee. Servlets Database Access. Learning Java Servlets in simple and easy steps using this. Here is an example which shows how to access TEST database using Servlet. A Simple Servlet Example – (write, deploy, run)By mkyong | December 1, 2. Updated : August 3. Viewed : 1. 79,4. Talking about the web technology, Java developers will keep talking about how powerful the Spring , Struts, Wicket, JSF…. When talking about the deployment, they will say using Ant script or Maven to build or deploy. Ironically, without the IDE or technology help, many Java developers do not know either how to create a simple servlet and deploy it , nor about writing the deployment descriptor.
The products database used in this example is very simple. /* The main servlet class makes the database connection. // The database connection is created in. 13.2 A Simple Servlet with GlassFish, Connector/J and MySQL. This section describes a simple servlet that can be. the connection with the database is as. Connect to MYSQL with servlet. Posted by: Mads Kristensen (). I want to connect my servlet to a MYSQL database. Connection con = DriverManager.getConnection. With simple configurations we can create a Database Connection Pool that is maintained by the Container itself. Most of the servlet containers such as Tomcat and JBoss. This is a simple JSP program to connect to MSSQL database. This is a simple JSP program to connect to. connection with mysql in servlet file.so i have. Nowadays , too many Java developers tight coupling with latest technology, do they know loose coupling is a good design for scalability : )? All the lasted technology is come from “Servlet” as foundation, you can not go far without it. Here’s a quick guide to write, deploy and run a simple servlet in web container, without any IDE help. Build the directory folder as following. Create a Java file named “Servlet. Demo. 1. java”, put in the “projectname/src/com/mkyong/” folder. IOException. import java. Print. Writer. import javax. Http. Servlet. import javax. Http. Servlet. Request. Http. Servlet. Response. Servlet. Demo. 1 extends Http. Servlet{. public void do. Ge(Http. Servlet. Request request, Http. Servlet. Response response). IOException{. Print. Writer out = response. Writer(). out. println("< html> "). Hello Servlet Get< /h. Create a deployment descriptor named web. UTF- 8"?>. < web- app version="2. XMLSchema- instance". Location="http: //java. Servlet Name For Demo. Servlet. Demo. 1< /servlet- class>. Servlet Name For Demo. Demo. 1< /url- pattern>. P. S servlet- name is the alias name for the Servlet. Demo. 1 class. P. S url- pattern is the url path you type in browser address bar. From the project directory “projectname”, compile it with following command. Servlet. Demo. 1. C: \Program Files\Java\j. The “javaee. jar” is required for http servlet , this library is packed with J2. EE SDK. In addition, all compiled classes will put in “classes” folder automatically. Build the directory folder in Tomcat. WEB- INF (Do not change this folder name). Copy all required files to Tomcat\WEB- INF folder– “Servlet. Demo. 1. java” to “Tomcat\WEN- INF\classes\com\mkyong”– “web. Tomcat\WEN- INF\”. WEB- INF. \- -web. New file]. \- -classes. Servlet. Demo. 1. New file]. 7) Start Tomcat. Done ~ Launch your browser and type “http: //localhost: 8. Demo. 1”P. S Once the the servlet class is updated, Tomcat have to restart to take effect. Java Servlets and Access Databases. Java Servlets, Access Databases, and. Stand Alone Server. Stand Alone Server. A free stand alone server can be downloaded from the Apache open software. It is Tomcat 4. 0. Directions for installation can be found at http: //archive. Using- Tomcat. html. Make sure that you download the regular version, not the LE version. The latter requires an XML parser and doesnt work without it. The directions at coreservlets also tell you which directories to use. Java servlets. The html files should be placed. ROOT subfolder of the Apache folder. The servlets. ROOT/WEB- INF/classes folder. If. Access Databases. Microsoft Access is a widely used personal computer database. In it, you can create linked tables that consist of rows and columns. The columns have field names such as Product. Name and Quantity. The. Note that there should not. The products database used in this example is very simple. It. Product. Table, which is shown below. The. Product. Id, Product. Name, Price, and Quantity. There. However, it is enough to demonstrate. To connect to the database using a Java servlet, you must first register. In Windows 9. 8 this is done. Settings/Control Panel/Data Sources (ODBC). In Windows. XP, you will find this same file in Settings/Control Panel/Administrative. Tools. Select Add/Microsoft Access Driver (*. Browse to find the location of your database. The connection is done with a jdbc- odbc bridge. Jdbc stands for. Java database connectivity API (application programmer interface), while. O in Odbc stands for Open. Odbc is a protocol from Microsoft. X/Open SQL specification. In a Java servlet. Connection object. The lines of code required are. Class. for. Name ("sun. Jdbc. Odbc. Driver"). Connection con = Driver. Manager. get. Connection ("jdbc: odbc: products"). The Connection and Driver. Manager objects are contained in the sql package. SQL stands for Structured Query Language. SQL is the standard way. It is not case sensitive, so you can. Some. examples are Select, Insert, Delete, and Update. You can also modify. Where or Set. An example. Select * From Product. Table Where Product. Id. This says to select all (*) the records from the Product. Table that. have the given Product. Id. Another example is. Update Product. Table Set Quantity = 'new. Quantity'. Where Product. Id = 'order. Id'. This statement updates the Quantity field in the record in Product. Table. that has order. Id as its Product. Id. HTML Forms. The interface to a servlet is an html (hypertext markup language) form. A simple example is. Order Form< /title> < /head>. Enter the id. of the product and the quantity desired.< /h. Make. Order. DB/" >. Id. < br> < input name="quantity" type="text" value="" size = 1. Quantity. < p> < input type="submit">. The form has a head and a body, both enclosed by appropriate tags. The head for this example only contains the title. The title should be. In the form, all. This begins with some information for. This tells the client what to do with the form. Here it explains that product information should be entered into the text. These are defined between the form tags. The method. If you are using servlets the "post" method. The action value is more complicated. It has to tell the form. In this. case, the servlet is on the same computer as the html form, so it is accessed. The remainder of the action string says. Make. Order. DB. The classes for this servlet. Make. Order. DB. It is accessed from your browser using http: //localhost/Make. Order. DB. html. The remainder of the form is filled by three input tags, the first two. Submit button. The form. Both input tags contain name fields. These names are used by the. The URL string. that is created when the Submit button is clicked looks like the following. Make. Order. DB/? HX4. 56. V& quantity=3. This string begins with the address found in the action string. It then is followed by the values submitted for the id and quantity separated. The names of the text fields are listed in order. These become parameters for the servlet. In general, the URL string is coded with all spaces replaced by the. Letters. and digits are not changed, but a number of other characters are replaced. For example, the at sign (@) is replaced by %4. Java Servlets. Java servlets are used to process the parameters sent by the form. The servlet that processes the form above first looks in the database to. If this is found, it then checks. If so, it uses the price stored with the product. In this case the servlet will send back. It also updates the quantity. If the quantity is larger than the amount in stock a different message. We are sorry, but that item is out of stock. An actual e- commerce web site would certainly have a much more elaborate. The main class of a servlet extends the Http. Servlet class. This. SUN. To make things easier for you, it can also be found in. Documents directory of the website found at http: //csis. You can download it from there and store it with the other . You also have to tell the IDE you use to look there for this file. In JCreator, first click on Configure, then on Options , and then on Profiles. You should see the version of JDK that you are using listed there. Click on it and then on Edit. When you see the next window, click. Add and then Add Package Browse until you find the lib subdirectory. This will tell the compiler where. Http. Servlet classes needed to compile a servlet. The Http. Servlet classes are a part of javax, extended java. So. Like any import statements, these go at the beginning of the file. You need further import statements as well, such as import java. Servlets look much like applets at the beginning. A servlet class. Http. Servlet where an applet class extends Applet. An example. Make. Order. DB extends Http. Servlet. The principle methods in a servlet class are do. Get and do. Post. They both have the same parameters, Http. Servlet. Request and Http. Servlet. Response. The do. Get will usually look like the method below. Get (Http. Servlet. Request request. Http. Servlet. Response response). Number. Format. Exception nfexp). Number format exception"); }. IOException ioexp) {out. IO exception"); }. Get. Catching the IOException is required. The Number. Format. Exception. All parameters are sent to the servlet as Strings. Servlets can instantiate other classes and use their public methods. They can read and write to files, query databases, store data in arrays. But displaying results requires the servlet. This is the. response. Typically the servlet gets an instance of the Print. Writer. class, often called out. Print. Writer out = response. Writer (). Strings are written to out using println, just like with System. For example. out. The total bill is " +. Notice the html tags inside the string, < h. All tags and other data that are to be displayed by the clients browser. As usual, make sure that the quotation. Sample Java Servlet. The following Java servlet can be used with the stand alone server and. This is an example of a Java servlet that connects with an Access. It is called by a web page with a form. ID and the quantity to be purchased. The ID is sent to the database, which then returns the record with the. ID. The quantity on hand is then checked against the quantity. If there is enough of the product in the database, the order. The bill is then displayed for the client. If. Out of Stock message is sent back. The main servlet class makes the database connection, gets the order. Make. Order extends Http. Servlet. private Connection con. Print. Writer out. The database connection is created in the. Name is a static method that forces the use of the jdbc- odbc bridge.. Class. for. Name ("sun. Jdbc. Odbc. Driver"). Driver. Manager. get. Connection ("jdbc: odbc: products"). SQLException ex) {out. SQL Exception.< /h. Class. Not. Found. Exception. cex) {out. Class Not Found Exception.< /h. The do. Get method is used to get the order. Get (Http. Servlet. Request request. Http. Servlet. Response response). Writer (). Order order = new Order (con, out). Data. From. Client (request). Order (). } catch (IOException. IO Exception.< /h. Servlet. Exception. Servlet Exception.< /h. Exception. e){out. Database connection exception.< /h. Database connection exception.< /h. The servlet will send an html response page to. This method creates the header for that page. Header (String title). DOCTYPE HTML PUBLIC '- //W3. C//DTD HTML 4. 0 Transitional//EN'> "). HTML> "). ("< head> "). Header. // The end of the html page consists only of. Foot () {out. println ("< /body> < /html> "). Make. Order. /* The Product class is used to store and process all information about. It has instance fields for all the fields in a. There are methods to get and display a product. String product. Name. String get. Product. Name. () {return product. Name; }. protected double get. Price. () {return price; }. Quantity. () {return quantity; }. The Order class sends. The database then responds with a Result. Set. The method, get. Product, extracts the individual fields from one record. Product (Result. Set. Print. Writer out). Id = rs. get. String ("Product. Id"). product. Name = rs. String ("Product. Name"). price = rs. Double ("Price"). Int ("Quantity"). Exception ex){out. Connection Error.< /h. Product. // This method creates. Product. (Print. Writer out). Product Name: " + product. Name ). out. println ("< br> Product Id: " + product. Id). out. println ("< br> Product Price: " + price ). Product Quantity: " + quantity + "< /h. Product. }// class Product. The Order class processes the data sent in by the client. It. The query is then submitted. The Result. Set is then used to get and display the. If there is sufficient quantity, the order is processed. This is then returned to the client. Connection con. private Print. Writer out. private Product product. String order. Id. Ordered, quanitity. In. Stock. Order (Connection con, Print. Writer out). this. The servlet request is used to get the data. Data. From. Client (Http.
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None of this payment goes to LSU. It is important that the student register for ALEKS through my. LSU, as this is the only way for the student’s ALEKS score to get reported to LSU. Two portals into ALEKS: “Take the Placement [Assessment]” and “Learning Module”. Upon entering ALEKS through the above steps, the student will eventually see two portals, one entitled “Take the Placement [Assessment],” and the other entitled “Learning Module.”. The first time the student enters ALEKS, the Learning Module portal is dimmed out, and the student can enter ALEKS only through the “Take the Placement” portal. The placement assessment in the “Take the Placement” portal is called the “initial” assessment; it takes about 9. ALEKS will automatically report the student’s initial assessment score to LSU the next business day.). After the student completes the initial assessment, ALEKS presents a report listing the precalculus topics the student has a good command of, and a list of precalculus topics that the student has not yet mastered. If the student is not satisfied with his initial score, he should not attempt to immediately re- take the initial assessment. ALEKS through the Learning Module portal (which by then will no longer be dimmed out). The student will have access to the Learning Module for six weeks starting from the first time he clicks on “Learning Module.”. Caution: After the expiration of the 6- week period of access to the Learning Module, the student may not buy a second 6- week period through LSU until the next “semester placement cycle” (see “ALEKS calendar” below); the ALEKS website does not warn the student of this rule. Do not confuse the “initial” assessment with the “progress” assessment. In the Learning Module, in addition to short, easy- to- follow lessons, there is also something called an assessment, which is a practice or “progress” assessment mirroring the assessment for placement. Scores on the progress assessment do not get reported to LSU. During the 6- week Learning Module access period, the Learning Module and the progress assessment can be accessed without limit. After the student has mastered some new topics in the Learning Module, he may re- enter ALEKS through the “Take the Placement” portal and take a new “initial” assessment. LSU. Caution: ALEKS allows a student to take the “initial” assessment (the one accessed through the “Take the Placement” portal) no more than 5 times in one semester placement cycle (see “ALEKS calendar” below). The student may take these successive, “initial” assessments even beyond the 6- week period of Learning Module access, but not beyond the end of the current semester placement cycle. Learning Module extends beyond the current semester placement cycle, the student cannot continue to take any more of the 5 “initial” assessments until the next semester placement cycle, and even then, only upon payment of another $2. ALEKS website does not warn the student about this. The last initial score (not the highest) is the one used to determine eligibility for taking Math 1. Initial ALEKS score too low. If a student’s score on the initial placement assessment is too low, he or she should proceed to the Learning Module and go through the lessons for several topics. Students should expect to require 2- 3 hours' work on the ALEKS Learning Module lessons for each 1% increase in ALEKS score needed. Once the score on the progress assessment is 7. For students who will eventually need Math 1. ALEKS score in time for the upcoming semester, the Math department recommends taking Math 1. Intermediate Algebra (offered also by LSU Independent and Distance Learning). Placement. Credit, and consult an advisor. It is expected that earning an A or B in Math 1. ALEKS score. however, the A or B by itself does not qualify a student to take calculus. When to take ALEKS. Here there are several factors to consider. ALEKS tests students’ knowledge of algebra and trigonometry. Consequently, students currently taking LSU's Math 1. Advanced Mathematics (precalculus version), Pre- Calculus, Trigonometry, or any calculus course that includes trigonometry, should probably wait until they have completed or almost completed that course before beginning ALEKS. Students who earn an A or B in such a course can expect to do well on the initial ALEKS assessment. ALEKS score if they are prepared to spend sufficient time with the ALEKS learning module. While precalculus courses will help prepare the student to take ALEKS, the ALEKS learning module will, conversely, help a student master topics in his or her precalculus courses.). Students should take the initial ALEKS assessment early enough to allow time to make sufficient progress in the ALEKS Learning Module, if needed, or to schedule a lower math course. Incoming freshmen and incoming transfer students who are interested in taking Math 1. LSU should take ALEKS before their LSU Orientation meeting, if possible, so that their counselors can place them into the right Math course. The student should choose the semester in which he or she plans to take Math 1. ALEKS calendar below. The second column will then give a six- month freshness window; an ALEKS score earned during that window will count as the prereq for Math 1. Math 1. 55. 0/1. 55. ALEKS Calendar: Window, Cancellation Date, and Purge Date, by semester. Semester in which student plans to take Math 1. Freshness window for ALEKS score to count as prerequisite for 1. ALEKS account cancellation date. ALEKS purge date for Math 1. Fall 2. 01. 5. Feb. Sept. 2, 2. 01. 5. Sept. 2, 2. 01. 5. July 1. 5, 2. 01. PM. Spring 2. 01. July 1. 7, 2. 01. Jan. 2. 5, 2. 01. Nov. 1. 6, 2. 01. PM. Summer 2. 01. December 9, 2. 01. June 9, 2. 01. 6. Feb. 2. 3, 2. 01. April 1. 3, 2. 01. PM. Fall 2. 01. 6. Feb. 2. 4, 2. 01. Aug. 3. 1, 2. 01. TBA (2. 01. 6). July 1. PM. ALEKS requires each university to establish its own “semester placement cycles”; we refer to the last day of such a cycle as the ALEKS account cancellation date for that semester. The above table shows the ALEKS account cancellation dates at LSU. On that date, ALEKS will not cancel the student’s 6- week period of access to the ALEKS Learning Module if that period is still ongoing, but ALEKS will cancel the student’s access to the “Take the Placement” portal. Thus, even if the student has done the initial assessment only once, and he then did some work in the Learning Module and is now ready to take the initial assessment a second time, he won’t be able to do so after the account cancellation date, even if fewer than six weeks have elapsed since the student had signed up for ALEKS. Consequently, most students will not want to purchase ALEKS shortly before the ALEKS account cancellation date. Students who sign up for ALEKS after the account cancellation date are treated by ALEKS as new students, whether they have used ALEKS before or not. ALEKS Learning Module may purchase it after the ALEKS account cancellation date. The fourth column gives the ALEKS purge date for Math 1. Before that date, students can provisionally schedule Math 1. Graduate Programs. Program. Accounting: MPAcc: Administration and Supervision: MEd. Graduate academic programs at ESF share a foundation of rigorous science and dedication to wise use of natural resources. ESF offers advanced degrees in six program. Review Environmental Management Graduate Programs on GradSchools.com the top site for Environmental Management degrees from accredited colleges & universities. Students who pursue the Environmental Design degree will learn core knowledge of design and construction disciplines and business practices related to human-designed. The Architectural Design major seeks to integrate engineering and architecture in ways that blend innovative architectural design with cutting-edge engineering. Carleton offers you outstanding graduate programs, remarkable research opportunities, intriguing internships and collaborations with supportive staff and f. EVDS | Faculty of Environmental Design. Thursday, March 3, 2. Professional Faculties 2. While Louis Sullivan may have given the skyscraper artistic breath, it was William Le Baron Jenney who conceived the skyscraper format from its birth. A true Renaissance Man, Jenney was an architect, an engineer, and a landscape architect. His world travels brought him to study architecture informally, yet he studied architecture academically in France. Northern Virginia Family Service (NVFS)2. CARE Awards Launch Event. When: Wednesday, April 6, 2. Family Services of Northeast Wisconsin. is a non-profit, human services agency that protects, heals and cares for the children and families of Northeast Wisconsin. The Department of Children & Families has several programs that can help Florida families. These include ACCESS Florida, Adult Services, and Child Care. Where: Custom. Ink. District Avenue. Fairfax, VA 2. What: Join us for this special gathering of past award winners and prospective applicants. Past award winners will be available to discuss the process of winning and what this prestigious award has meant to their bottom lines. Establish and reinvigorate your relationships, and walk away with best practices and tangible, actionable steps you can take to your own organization. Ohio Job And Family Services ProgramsChild & Family has a long history of developing programs and services that meet the changing needs of families in Newport County and throughout Rhode. This is the Home page for Family Service Association Nonprofit Fundraising Charity. Hors d'oeuvres will be served. Attendance Is Limited! Please RSVP to: Alyssa Lee. Family Services’ mission is to help families and individuals help themselves through direct services, collaboration, and advocacy. The Aegis Ballistic Missile. is a United States Department of Defense Missile Defense Agency program developed to. Aegis Ballistic Missile Defence (BMD. United States national missile defense. But missile defense against a known ballistic missile. including China's rocket and missile tests, a US defence. Join us at the USA Science. to other elements of the Ballistic Missile. tracking of intercontinental ballistic missiles and work with other BMDS. U.S. Missile Defense Programs at a Glance. to oversee missile defense programs through the Missile. Ballistic Missile Defense (BMD) Program & Key. Ballistic Missile Defense; Connect With Us. nuclear program is intended solely. allies around the globe to expand their ballistic missile defense. Canada, and the US Ballistic Missile Defence Program 1. Canada, and the US Ballistic Missile Defence Program By Oleg Nekrassovski The two key factors that. The Missile Defense Agency has fielded an initial capability to protect the U.S and our allies against limited ballistic missile. defend the United States. Germany and the United States have provided. U.S. Aegis Ballistic Missile Defense. How does NATO Ballistic Missile Defence Work? . and operation of the SPIRALE program. (THAAD) is a key element of the United States (US) Ballistic Missile Defence System (BMDS) designed to defend US. The Ballistic Missile Defense System (BMDS) Please click on a portion of the graphic above to learn more about that element of the Ballistic Missile Defense System. Ballistic Missile Defense - Council on Foreign Relations. Introduction. U. S. U. S. homeland, deployed military forces, and allies from limited attacks. The Pentagon originally sought development of ballistic missile defense (BMD) technology to counter the Soviet nuclear threat during the Cold War, but its focus in the twenty- first century has shifted to defending against potential strikes from regional actors, particularly Iran and North Korea. Proponents of BMD stress its role in the projection of U. S. power and its value as a deterrent, while critics question its reliability and high costs. In recent years, some military analysts have said that the planned expansion of U. S- NATO missile defense systems in the former Soviet bloc has unnecessarily frayed relations with Moscow. How does ballistic missile defense work? Ballistic missiles can be launched from a variety of platforms, including silos, trucks, trains, submarines, and warships. There are four general classifications based on the maximum distance the missile can travel: short range (less than 1,0. Ballistic missiles have three stages of flight: boost phase, which begins at launch and lasts until rocket engines finish; midcourse phase, the longest stage, when the projectile is on its parabolic path to the target; and terminal phase, when the detached warhead reenters the atmosphere, often traveling less than a minute to impact. Cruise missiles, by contrast, are jet- engine powered weapons that fly low and level to the ground, often avoiding enemy radar, before striking their target.)Defeating a ballistic missile involves four functions: detection, discrimination (separating the missile from everything else), fire control (determining exactly where to intercept), and killing (hitting the missile with some type of interceptor). However, the effectiveness of BMD systems in test trials has been mixed, and critics continue to question their value in realistic battle conditions. The effectiveness of BMD systems in test trials has been mixed, and critics continue to question their value in realistic battle conditions. What is the history of U. S. missile defense? The Pentagon launched an intensive effort to counter the threat of Soviet intercontinental ballistic missiles (ICBMs) in the mid- 1. U. S. Army, Air Force, and Navy. But by 1. 97. 2, with U. S. and Soviet arsenals growing exponentially, Washington and Moscow signed the Antiballistic Missile Treaty (ABM), limiting to two the number of missile defense sites each could maintain. In the early 1. 98. Reagan administration expanded research and development of space- and ground- based defensive systems, and unveiled the Strategic Defense Initiative [PDF], later nicknamed "Star Wars." The next year, the army tested its Homing Overlay Experiment, the first successful demonstration of a hit- to- kill vehicle. Meanwhile, tactical systems, or theater missile defense, continued to develop. U. S. Patriot missile batteries, originally designed to intercept Soviet intermediate- range ballistic missiles in Western Europe, were deployed to the Middle East during the Persian Gulf War. While they proved ineffective at defending against Scud attacks on Israel and Saudi Arabia in 1. By the latter part of the decade, BMD advocates pushed for a full- blown national missile defense system, citing nascent North Korean, Iraqi, and Iranian threats. Leading defense officials in the George W. Bush administration envisioned an integrated, layered defense capable of defeating enemy missiles on a global scale. Early in his first term, Bush withdrew the United States from the ABM treaty and instructed the Pentagon to "proceed with fielding an initial set of missile defense capabilities." The first ground- based missile interceptor was installed at an army base in central Alaska in July 2. What are the primary missile defense systems? The U. S. Missile Defense Agency (MDA) is developing a number of systems that could offer multiple opportunities to defeat limited ballistic missile attacks. These systems are not designed to shield against large- scale nuclear attacks from Russia and China. MDA has spent roughly $1. Pentagon's base budget. There are four primary BMD programs: Ground- Based Midcourse Defense: The most complex and costly component of the U. S. missile defense system is designed to destroy intermediate- and long- range ballistic missiles in space. As of summer 2. 01. Fort Greely, Alaska, and four at Vandenberg Air Force Base, California, with plans to increase this arsenal to forty- four by 2. In a June 2. 01. 4 test, an interceptor launched from Vandenberg destroyed a target missile launched from the Marshall Islands, marking the first successful hit (out of four tries) since 2. But experts say the technology is still unreliable and needs further testing. Meanwhile, some U. S. officials are advocating for the construction of a third interceptor site on the Eastern seaboard, and the MDA is assessing prospective locations. Aegis Ballistic Missile Defense: Considered the most reliable component of missile defense, this traditionally sea- based system is designed to intercept short- and medium- range ballistic missiles. The Missile Defense Agency and the Navy plan to increase the number of BMD- capable Aegis warships from 3. As of June 2. 01. Pentagon said the system had twenty- eight successful intercepts out of thirty- four tests. Terminal High Altitude Area Defense: THAAD is a rapidly deployable, truck- mounted system capable of intercepting short- and medium- range ballistic missiles inside and just outside the atmosphere. Three THAAD systems were operational as of mid- 2. Pentagon is expected to expand this to seven. In April 2. 01. 3, the Army deployed a THAAD battery to Guam to help defend the U. S. territory from North Korean intermediate- range ballistic missiles. Patriot Advanced Capability–3: The PAC- 3 is the successor to the systems deployed in the Persian Gulf War and the most mature system in the U. S. missile defense arsenal. Rapidly deployable, the system is vehicle- mounted and employs sensors to track and intercept incoming missiles in their terminal phase, at lower altitudes than THAAD systems. The PAC- 3 was used during combat missions in Iraq in 2. PAC- 3 batteries have been deployed to several nations including South Korea, Afghanistan, and Turkey, among others, and more than a dozen nations have purchased variants of the system. Source: GAO, Missile Defense: Opportunity to Refocus on Strengthening Acquisition Management, 2. What is the threat from North Korea? North Korea has several hundred short- range and medium- range ballistic missiles, and is developing an intermediate- range missile (Taepo Dong–2) that analysts say would be able to hit the continental United States should it become operational. The TD- 2 succeeded in placing a satellite in orbit in December 2. However, experts say the feat does not translate into a reliable missile, and that further testing is needed. North Korea's missiles are capable of delivering conventional warheads and, potentially, biological and chemical munitions. U. S. intelligence officials say that TD- 2 missiles could, in theory, deliver a nuclear payload to the United States, but noted that without further testing, the potential for this was low in the near term. Experts suspect Pyongyang has four to ten plutonium- based nuclear weapons, but analysts continue to speculate whether the regime has mastered the miniaturization technology required to mount a nuclear warhead on its missiles. Several UN Security Council resolutions passed in recent years prohibit North Korea from developing nuclear or ballistic missile technology. What is the threat from Iran? Experts say Iran has the largest ballistic missile arsenal in the Middle East, having obtained most of this from its allies, particularly North Korea. The majority of Iran's ballistic missile inventory consists of Scud missiles with a range of up to approximately 5. Tehran views these as important tactical weapons, but experts say their ability to strike U. S. and allied targets in the region is limited because they would need to be launched from vulnerable positions along the Persian Gulf. Furthermore, analysts say these missiles are not very accurate and serve more as a psychological threat to large urban and economic centers in the region. The Islamic Republic is also building a stockpile of longer- range ballistic missiles that are able to hit any target in the Middle East, including Israel, but analysts say these weapons suffer from significant inaccuracy. U. S. intelligence officials have warned in recent years of Iran's potential to deliver weapons of mass destruction with these missiles. In the 2. 01. 4 U. S. Worldwide Threat Assessment [PDF], Director of National Intelligence James Clapper said Iran has "the means and motivation to develop longer- range missiles, including an intercontinental ballistic missile." Tehran claims its controversial nuclear program is intended solely for peaceful applications, but Western analysts continue to speculate whether the regime has decided to pursue a nuclear weapon. Pursuant to UN Security Council Resolution 1. PDF], Iran is forbidden from developing ballistic missiles capable of delivering nuclear warheads. How does the United States collaborate with allies? A major component of U. S. military strategy is partnering with allies around the globe to expand their ballistic missile defense capabilities. The Aegis BMD system is the linchpin of the Obama administration's plan for a phased deployment of a missile defense umbrella in Europe, which is intended to protect U. S. forces and NATO allies from regional threats like Iran. NATO leaders adopted missile defense as a principal alliance objective at their 2. Lisbon Summit and approved the integration of U. S. and allied BMD efforts. In February 2. 01. USS Donald Cook arrived in the port of Rota, becoming the first of four Aegis warships to be based in Spain. The Ballistic Missile Defense System. Please click on a portion of the graphic above to learn more about that element of the Ballistic Missile Defense System (BMDS). Missile defense technology being developed, tested and deployed by the United States is designed to counter ballistic missiles of all ranges—short, medium, intermediate and long. Since ballistic missiles have different ranges, speeds, size and performance characteristics, the Ballistic Missile Defense System is an integrated, "layered" architecture that provides multiple opportunities to destroy missiles and their warheads before they can reach their targets. The system's architecture includes: networked sensors (including space- based) and ground- and sea- based radars for target detection and tracking; ground- and sea- based interceptor missiles for destroying a ballistic missile using either the force of a direct collision, called "hit- to- kill" technology, or an explosive blast fragmentation warhead; and a command, control, battle management, and communications network providing the operational commanders with the needed links between the sensors and interceptor missiles. Missile defense elements are operated by United States military personnel from U. S. Strategic Command, U. S. Northern Command, U. S. Pacific Command, U. S. Forces Japan, U. S. 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