<div>
Do two thing<br />
1. Change your JVM heap memory configuration, which is usually higher. Set -Xms and -Xms 2M only like below.<br />
<br />
-Xms2M -Xmx2M<br />
<br />
2. put this code in your servlet <br />
<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; String a=null;<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;List&lt;String&gt;abc=new ArrayList&lt;&gt;();<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;long i=0;<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;long k=0;<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;for (i=0;i&lt;674783848;i++){<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;for (k=0;k&lt;674783848;k++){<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;a=new String(Long.toString(k));<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;abc.add(a);<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br />
Restart your server and run.
</div>


Do two thing
1. Change your JVM heap memory configuration, which is usually higher. Set -Xms and -Xms 2M only like below.

-Xms2M -Xmx2M

2. put this code in your servlet

                String a=null;
            List<String>abc=new ArrayList<>();
            long i=0;
            long k=0;
            for (i=0;i<674783848;i++){
                  for (k=0;k<674783848;k++){
                        a=new String(Long.toString(k));
                        abc.add(a);
                  }
            }
            
Restart your server and run.

<div>
@ Ajay, thanks for the inputs. i dont know to write the code or create the complete project. so i am here.
</div>


@ Ajay, thanks for the inputs. i dont know to write the code or create the complete project. so i am here.

<div>
okay. Firstly you need to learn how to program for tomcat.
</div>


okay. Firstly you need to learn how to program for tomcat.

<div>
<div class="content wysiwyg-content">
can any one provide an sample application for tomcat 7.x that can trigger OutOfMemory and hung threads?.
</div>
</div>


can any one provide an sample application for tomcat 7.x that can trigger OutOfMemory and hung threads?.

bad application for tomcat 7.x

Java is a platform-independent, object-oriented programming language and run-time environment, designed to have as few implementation dependencies as possible such that developers can write one set of code across all platforms using libraries. Most devices will not run Java natively, and require a run-time component to be installed in order to execute a Java program.

Java

Java Enterprise Edition (Java EE) is a specification defining a collection of Java-based server and client technologies and how they interoperate. Java EE specifies server and client architectures and uses profiles to define technology sets targeted at specific classes of applications. All Java EE profiles share a set of common features, such as naming and resource injection, packaging rules and security requirements.

Java EE

JavaServer Pages (JSP) allow the development of dynamically generated web pages. It uses the Java programming language; JSP pages are translated into servlets at runtime, with each servlet being cached and reused until the JSP is modified. JSP allows Java code to be interleaved with static web markup content, so the resulting page can be compiled and executed on the server to deliver the content.