Question

I would like to use this applet this applet in a html document. In the example on this site they use :

<applet code="de.wim.outldd.examples.DragDropTest_Applet"
    width="150" height="150" alt="Applet1" archive="soutldd.jar">
</applet>

It does not work when I try it. My HTML document is in the middle of the extracted directory. How can I use the applet in html, somebody please try this.

THe error in the console

java.lang.RuntimeException: java.lang.ExceptionInInitializerError
    at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
    at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ExceptionInInitializerError
    at de.wim.outldd.OutlookDD.init(OutlookDD.java:73)
    at de.wim.outldd.examples.DragDropTest_Applet$1.run(DragDropTest_Applet.java:29)
    at java.security.AccessController.doPrivileged(Native Method)
    at de.wim.outldd.examples.DragDropTest_Applet.<init>(DragDropTest_Applet.java:26)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at java.lang.Class.newInstance0(Unknown Source)
    at java.lang.Class.newInstance(Unknown Source)
    at sun.plugin2.applet.Plugin2Manager$12.run(Unknown Source)
    at java.awt.event.InvocationEvent.dispatch(Unknown Source)
    at java.awt.EventQueue.dispatchEvent(Unknown Source)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.run(Unknown Source)
Caused by: java.security.AccessControlException: access denied (java.util.PropertyPermission java.io.tmpdir read)
    at java.security.AccessControlContext.checkPermission(Unknown Source)
    at java.security.AccessController.checkPermission(Unknown Source)
    at java.lang.SecurityManager.checkPermission(Unknown Source)
    at java.lang.SecurityManager.checkPropertyAccess(Unknown Source)
    at java.lang.System.getProperty(Unknown Source)
    at de.wim.outldd.OutlDDNativeLib.loadDllFromResource(OutlDDNativeLib.java:135)
    at de.wim.outldd.OutlDDNativeLib.loadDll(OutlDDNativeLib.java:104)
    at de.wim.outldd.OutlDDNativeLib.<clinit>(OutlDDNativeLib.java:62)
    ... 19 more
Exception: java.lang.RuntimeException: java.lang.ExceptionInInitializerError

Answer 1

Your applet is trying to read the temp directory value from the java.io.tmpdir system property which is previleged. Applets run in a sandbox environment with restricted permissions beacause of security reasons. To fix it, override the default security policy to allow your applet to read the property by setting the property permission – java.util.PropertyPermission, on the property. To override default permissions define the policy in your user home’s .java.policy file. It is recommended that you edit your user specific policy file and not the global policy file under your JRE security directory. Refer the template below:

grant codeBase "<code base>" { 
   permission <type> "<target>", "<actions>"; 
   permission <type> "<target>", "<actions>"; 
   ... 
}; 

For eg. 
grant codeBase "http://geosim.cs.vt.edu/geosim/-" { 
  permission java.util.PropertyPermission "java.io.tmpdir", "read";
  ... 
}; 

---

Edited:

---

I noticed that you already have the applet link specified in your post at the top. So, I am giving a step by step guide to get you started.

Here you go –

1. Copy $JRE_HOME/lib/security/java.policy file to your user home (on windows it is c:\users\< user name>) as .java.policy file. Please note the preceding “.” in the file name.

2. Add the following lines to the end of .java.policy file:

   grant codeBase “http://www.wilutions.com/outldd/-” {
   permission java.security.AllPermission;
   };

3. Run the applet in an appletviewer as follows and see if it works.
   appletviewer http://www.wilutions.com/outldd/example.html

4. Please note that I am specifying all permissions to the applet for sake the of geting you started but it is potentially insecure to grant all permmissions. You should grant only the required permissions. So, I leave it to you to figure it out.