stack trace

ant -f /home/ben/jmonkeyengine-projects-folder/JmeTests run
init:
Deleting: /home/ben/jmonkeyengine-projects-folder/JmeTests/build/built-jar.properties
deps-jar:
Updating property file: /home/ben/jmonkeyengine-projects-folder/JmeTests/build/built-jar.properties
compile:
run:
/home/ben/jmonkeyengine-projects-folder/JmeTests/nbproject/build-impl.xml:401: java.io.IOException: Cannot run program "/home/ben/jmonkeyplatform/jdk/jre/bin/java" (in directory "/home/ben/jmonkeyengine-projects-folder/JmeTests"): error=13, Toegang geweigerd
	at org.apache.tools.ant.taskdefs.Java.fork(Java.java:798)
	at org.apache.tools.ant.taskdefs.Java.executeJava(Java.java:214)
	at org.apache.tools.ant.taskdefs.Java.executeJava(Java.java:135)
	at org.apache.tools.ant.taskdefs.Java.execute(Java.java:108)
	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
	at sun.reflect.GeneratedMethodAccessor68.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
	at org.apache.tools.ant.Task.perform(Task.java:348)
	at org.apache.tools.ant.taskdefs.Sequential.execute(Sequential.java:68)
	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
	at sun.reflect.GeneratedMethodAccessor68.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
	at org.apache.tools.ant.Task.perform(Task.java:348)
	at org.apache.tools.ant.taskdefs.MacroInstance.execute(MacroInstance.java:398)
	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
	at sun.reflect.GeneratedMethodAccessor68.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
	at org.apache.tools.ant.Task.perform(Task.java:348)
	at org.apache.tools.ant.Target.execute(Target.java:392)
	at org.apache.tools.ant.Target.performTasks(Target.java:413)
	at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1399)
	at org.apache.tools.ant.Project.executeTarget(Project.java:1368)
	at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
	at org.apache.tools.ant.Project.executeTargets(Project.java:1251)
	at org.apache.tools.ant.module.bridge.impl.BridgeImpl.run(BridgeImpl.java:283)
	at org.apache.tools.ant.module.run.TargetExecutor.run(TargetExecutor.java:541)
	at org.netbeans.core.execution.RunClassThread.run(RunClassThread.java:153)
Caused by: java.io.IOException: Cannot run program "/home/ben/jmonkeyplatform/jdk/jre/bin/java" (in directory "/home/ben/jmonkeyengine-projects-folder/JmeTests"): error=13, Toegang geweigerd
	at java.lang.ProcessBuilder.start(ProcessBuilder.java:1041)
	at java.lang.Runtime.exec(Runtime.java:617)
	at org.apache.tools.ant.taskdefs.Execute$Java13CommandLauncher.exec(Execute.java:862)
	at org.apache.tools.ant.taskdefs.Execute.launch(Execute.java:481)
	at org.apache.tools.ant.taskdefs.Execute.execute(Execute.java:495)
	at org.apache.tools.ant.taskdefs.Java.fork(Java.java:791)
	... 32 more
Caused by: java.io.IOException: error=13, Toegang geweigerd
	at java.lang.UNIXProcess.forkAndExec(Native Method)
	at java.lang.UNIXProcess.<init>(UNIXProcess.java:135)
	at java.lang.ProcessImpl.start(ProcessImpl.java:130)
	at java.lang.ProcessBuilder.start(ProcessBuilder.java:1022)
	... 37 more
Java Result: -1
BUILD SUCCESSFUL (total time: 0 seconds)