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Details

Type: Improvement
Resolution: Unresolved
Priority: Major
Component/s: core
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Released As:
2.312

Description

When running on Java 7, Jenkins should ensure that all its ClassLoader instances are marked parallel-capable. This would improve class loading speed in some circumstances—mainly during startup or when first using new features, but also when searching for Groovy imports and the like.

At least UberClassLoader, DependencyClassLoader, AntClassLoader2, and PluginFirstClassLoader should be so marked. (PluginFirstClassLoader ought to be made to extend AntClassLoader2 since we control it; all superclasses must be marked.) To work on Java 7, can use this idiom:

try {
    Method m = ClassLoader.class.getDeclaredMethod("registerAsParallelCapable");
    m.setAccessible(true);
    boolean b = (Boolean) m.invoke(null);
    if (!b) {
        ...warn...
    }
} catch (NoSuchMethodException x) {
    // fine, Java 6
} catch (Exception x) {
    ...warn...
}