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POWeird behavior in Struts2
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  1. POWeird behavior in Struts2
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    copied!<p>I was working on Struts and encountered some strange behavior. Though it is not creating any errors or bugs I just thought it would be interesting to share it with you folks.</p> <p>Perhaps one of you can explain why this is happening.</p> <p>Create a Struts action with following code - </p> <pre><code>public class MyAction extends ActionSupport { private Map&lt;String, Map&lt;String, Object&gt;&gt; map = new HashMap&lt;String, Map&lt;String, Object&gt;&gt;(); public String execute() { System.out.println(map); return SUCCESS; } public Map&lt;String, Map&lt;String, Object&gt;&gt; getMap() { return map; } public void setMap(Map&lt;String, Map&lt;String, Object&gt;&gt; map) { this.map = map; } } </code></pre> <p>Create associated mappings and Jsp required and execute the action. You will see following output on the console - </p> <pre><code>{systemProperties={java.runtime.name=Java(TM) SE Runtime Environment, sun.boot.library.path=C:\Program Files\Java\jdk1.6.0_32\jre\bin, java.vm.version=20.7-b02, shared.loader=${catalina.base}/shared/classes .... </code></pre> <p>So apparently Struts is injecting the system properties into my map. But why is it doing so? I didn't ask it to do so. There is no special XML configuration or annotation that I've used. What part of Struts (what interceptor) is responsible for this? Have I just discovered a bug or is this normal behavior? If it's normal why the heck did Struts developer think it'd be wise to inject every <code>Map&lt;String, Map&lt;String, Object&gt;&gt;</code> with system properties?</p>
 

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