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java.lang.InstantiationException in plugin [message #99448]

Mon, 08 October 2007 13:46

Eclipse User

Originally posted by: slider161.hotmail.com

I trying to activate a plugin that runs a JUnit test suite using an Ant script. However I keep getting an error

"The activator org.eclipse.core.runtime.Plugin for bundle com.propylon.core.Test is invalid"

"Caused by: java.lang.InstantiationException"

Thrown when an application tries to create an instance of a class using the newInstance method in class Class, but the specified class object cannot be instantiated because it is an interface or is an abstract class.

Somewhere the Class.newInstance() method is being invoked on Plugin (the abstract class) rather than Activator (the non-abstract one), why?

I created the plugin project using the eclispe wizard this its the Activator class it generated

package com.propylon.core.test;

import org.eclipse.core.runtime.Plugin;

import org.osgi.framework.BundleContext;

/**

* The activator class controls the plug-in life cycle

*/

public class Activator extends Plugin {

// The plug-in ID

public static final String PLUGIN_ID = "com.propylon.core.Test";

// The shared instance

private static Activator plugin;

/**

* The constructor

*/

public Activator() {

}

/*

* (non-Javadoc)

* @see org.eclipse.core.runtime.Plugins#start(org.osgi.framework.Bu ndleContext)

*/

public void start(BundleContext context) throws Exception {

super.start(context);

plugin = this;

}

/*

* (non-Javadoc)

* @see org.eclipse.core.runtime.Plugin#stop(org.osgi.framework.Bund leContext)

*/

public void stop(BundleContext context) throws Exception {

plugin = null;

super.stop(context);

}

/**

* Returns the shared instance

*

* @return the shared instance

*/

public static Activator getDefault() {

return plugin;

}

}

below is the stack trance:

java-test:

[echo] Running com.propylon.core.tests.testcase.AllTests. Result file: C:/eclipse3.3/results/com.propylon.core.tests.testcase.AllTe sts.xml.

[java] org.osgi.framework.BundleException: The activator org.eclipse.core.runtime.Plugin for bundle com.propylon.core.Test is invalid

[java] at org.eclipse.osgi.framework.internal.core.AbstractBundle.load BundleActivator(AbstractBundle.java:141)

[java] at org.eclipse.osgi.framework.internal.core.BundleContextImpl.s tart(BundleContextImpl.java:970)

[java] at org.eclipse.osgi.framework.internal.core.BundleHost.startWor ker(BundleHost.java:346)

[java] at org.eclipse.osgi.framework.internal.core.AbstractBundle.star t(AbstractBundle.java:260)

[java] at org.eclipse.osgi.framework.util.SecureAction.start(SecureAct ion.java:400)

[java] at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter .postFindLocalClass(EclipseLazyStarter.java:111)

[java] at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLoc alClass(ClasspathManager.java:417)

[java] at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.fin dLocalClass(DefaultClassLoader.java:189)

[java] at org.eclipse.osgi.framework.internal.core.BundleLoader.findLo calClass(BundleLoader.java:340)

[java] at org.eclipse.osgi.framework.internal.core.BundleLoader.findCl assInternal(BundleLoader.java:408)

[java] at org.eclipse.osgi.framework.internal.core.BundleLoader.findCl ass(BundleLoader.java:369)

[java] at org.eclipse.osgi.framework.internal.core.BundleLoader.findCl ass(BundleLoader.java:357)

[java] at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loa dClass(DefaultClassLoader.java:83)

[java] at java.lang.ClassLoader.loadClass(Unknown Source)

[java] at org.eclipse.osgi.framework.internal.core.BundleLoader.loadCl ass(BundleLoader.java:289)

[java] at org.eclipse.osgi.framework.internal.core.BundleHost.loadClas s(BundleHost.java:227)

[java] at org.eclipse.osgi.framework.internal.core.AbstractBundle.load Class(AbstractBundle.java:1269)

[java] at org.eclipse.test.EclipseTestRunner.loadSuiteClass(EclipseTes tRunner.java:302)

[java] at org.eclipse.test.EclipseTestRunner.getTest(EclipseTestRunner .java:233)

[java] at org.eclipse.test.EclipseTestRunner.<init>(EclipseTestRunner.java:216)

[java] at org.eclipse.test.EclipseTestRunner.run(EclipseTestRunner.jav a:200)

[java] at org.eclipse.test.CoreTestApplication.runTests(CoreTestApplic ation.java:35)

[java] at org.eclipse.test.CoreTestApplication.run(CoreTestApplication .java:31)

[java] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

[java] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

[java] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

[java] at java.lang.reflect.Method.invoke(Unknown Source)

[java] at org.eclipse.equinox.internal.app.EclipseAppContainer.callMet hod(EclipseAppContainer.java:533)

[java] at org.eclipse.equinox.internal.app.EclipseAppHandle.run(Eclips eAppHandle.java:155)

[java] at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher .runApplication(EclipseAppLauncher.java:106)

[java] at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher .start(EclipseAppLauncher.java:76)

[java] at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseS tarter.java:363)

[java] at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseS tarter.java:176)

[java] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

[java] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

[java] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

[java] at java.lang.reflect.Method.invoke(Unknown Source)

[java] at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java: 504)

[java] at org.eclipse.equinox.launcher.Main.basicRun(Main.java:443)

[java] at org.eclipse.equinox.launcher.Main.run(Main.java:1169)

[java] at org.eclipse.equinox.launcher.Main.main(Main.java:1144)

[java] at org.eclipse.core.launcher.Main.main(Main.java:30)

[java] Caused by: java.lang.InstantiationException

[java] at sun.reflect.InstantiationExceptionConstructorAccessorImpl.ne wInstance(Unknown Source)

[java] at java.lang.reflect.Constructor.newInstance(Unknown Source)

[java] at java.lang.Class.newInstance0(Unknown Source)

[java] at java.lang.Class.newInstance(Unknown Source)

[java] at org.eclipse.osgi.framework.internal.core.AbstractBundle.load BundleActivator(AbstractBundle.java:136)

[java] ... 41 more

[java] Java Result: 2

Has anyone come across this problem before? Do I need to change some setting in eclipse or modify may activator class?

Thank you for your time

slider

Re: java.lang.InstantiationException in plugin [message #99917 is a reply to message #99448]

Tue, 16 October 2007 18:02

Eclipse User

What is the value of the Bundle-Activator header in your bundle's
manifest file (META-INF/MANIFEST.MF). Does it specify your activator
class? I recommend you open a bug against PDE-UI with the steps you
used to generate the activator class.

Tom

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