problem loading Apple LAF classes

[Sangjin Lee]

I'm running into an interesting classloading problem with Felix
(2.0.0) on my mac. I have a simple test activator like the following:

public class LAFClassLoadingTest implements BundleActivator {
    public void start(BundleContext c) throws Exception {
        // loads internal apple laf class via Class.forName()
        UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
    }

    public void stop(BundleContext c) {}
}

When I install and start this bundle, I get a NoClassDefFoundError
with apple/laf/CoreUIControl:

org.osgi.framework.BundleException: Activator start error in bundle
lafclassloading_test [4].
    at org.apache.felix.framework.Felix.activateBundle(Felix.java:1750)
    at org.apache.felix.framework.Felix.startBundle(Felix.java:1621)
    at org.apache.felix.framework.BundleImpl.start(BundleImpl.java:890)
    at org.apache.felix.shell.impl.StartCommandImpl.execute(StartCommandImpl.java:114)
    at org.apache.felix.shell.impl.Activator$ShellServiceImpl.executeCommand(Activator.java:281)
    at org.apache.felix.shell.tui.Activator$ShellTuiRunnable.run(Activator.java:184)
    at java.lang.Thread.run(Thread.java:637)
Caused by: java.lang.NoClassDefFoundError: apple/laf/CoreUIControl
    at com.apple.laf.AquaLookAndFeel$1.run(AquaLookAndFeel.java:123)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.apple.laf.AquaLookAndFeel.initialize(AquaLookAndFeel.java:120)
    at javax.swing.UIManager.setLookAndFeel(UIManager.java:545)
    at javax.swing.UIManager.setLookAndFeel(UIManager.java:590)
    at org.osgi.test.LAFClassLoadingTest.start(LAFClassLoadingTest.java:13)
    at org.apache.felix.framework.util.SecureAction.startActivator(SecureAction.java:667)
    at org.apache.felix.framework.Felix.activateBundle(Felix.java:1699)
    ... 6 more
java.lang.NoClassDefFoundError: apple/laf/CoreUIControl

I googled for this issue, and tried a couple of suggested solutions.

First, I tried adding the apple.laf package to the
org.osgi.framework.system.packages.extra property, and also added it
to the Import-Package property of my bundle. It still failed with the
same error, although I could see that the dependency was successfully
resolved.

Second, I tried the org.osgi.framework.bootdelegation property, and
added apple packages. Still no success, and I failed with the same
NoClassDefFoundError.

Can anyone shed light on why this classloading is not working even
with these solutions, and what is the "right" way to make this work?

FYI, the bundle starts just fine with Equinox.

Thanks,
Sangjin

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[Karl Pauls]

Try to set the Thread context classloader to be the classloader of
your bundle before the call to UIManager.

regards,

Karl

On Wed, Oct 14, 2009 at 10:27 PM, Sangjin Lee <sjlee0@...> wrote:

> I'm running into an interesting classloading problem with Felix
> (2.0.0) on my mac. I have a simple test activator like the following:
>
> public class LAFClassLoadingTest implements BundleActivator {
>     public void start(BundleContext c) throws Exception {
>         // loads internal apple laf class via Class.forName()
>         UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
>     }
>
>     public void stop(BundleContext c) {}
> }
>
> When I install and start this bundle, I get a NoClassDefFoundError
> with apple/laf/CoreUIControl:
>
> org.osgi.framework.BundleException: Activator start error in bundle
> lafclassloading_test [4].
>     at org.apache.felix.framework.Felix.activateBundle(Felix.java:1750)
>     at org.apache.felix.framework.Felix.startBundle(Felix.java:1621)
>     at org.apache.felix.framework.BundleImpl.start(BundleImpl.java:890)
>     at org.apache.felix.shell.impl.StartCommandImpl.execute(StartCommandImpl.java:114)
>     at org.apache.felix.shell.impl.Activator$ShellServiceImpl.executeCommand(Activator.java:281)
>     at org.apache.felix.shell.tui.Activator$ShellTuiRunnable.run(Activator.java:184)
>     at java.lang.Thread.run(Thread.java:637)
> Caused by: java.lang.NoClassDefFoundError: apple/laf/CoreUIControl
>     at com.apple.laf.AquaLookAndFeel$1.run(AquaLookAndFeel.java:123)
>     at java.security.AccessController.doPrivileged(Native Method)
>     at com.apple.laf.AquaLookAndFeel.initialize(AquaLookAndFeel.java:120)
>     at javax.swing.UIManager.setLookAndFeel(UIManager.java:545)
>     at javax.swing.UIManager.setLookAndFeel(UIManager.java:590)
>     at org.osgi.test.LAFClassLoadingTest.start(LAFClassLoadingTest.java:13)
>     at org.apache.felix.framework.util.SecureAction.startActivator(SecureAction.java:667)
>     at org.apache.felix.framework.Felix.activateBundle(Felix.java:1699)
>     ... 6 more
> java.lang.NoClassDefFoundError: apple/laf/CoreUIControl
>
> I googled for this issue, and tried a couple of suggested solutions.
>
> First, I tried adding the apple.laf package to the
> org.osgi.framework.system.packages.extra property, and also added it
> to the Import-Package property of my bundle. It still failed with the
> same error, although I could see that the dependency was successfully
> resolved.
>
> Second, I tried the org.osgi.framework.bootdelegation property, and
> added apple packages. Still no success, and I failed with the same
> NoClassDefFoundError.
>
> Can anyone shed light on why this classloading is not working even
> with these solutions, and what is the "right" way to make this work?
>
> FYI, the bundle starts just fine with Equinox.
>
> Thanks,
> Sangjin
>
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> To unsubscribe, e-mail: users-unsubscribe@...
> For additional commands, e-mail: users-help@...
>
>

--
Karl Pauls
karlpauls@...

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