Groovy language - classNotFoundException in OSGi environment

The problem is in the following method of the GroovyLanguage

@SuppressWarnings("unchecked")
protected Class<Script> parseExpression(String expression) {
return new GroovyClassLoader().parseClass(expression);
}

It uses the default constructor to create GroovyClassLoader, which uses Thread context classloader, which may not be equal to the classloader of the bundle where the camel context is defined.

Caused by: java.lang.NoClassDefFoundError: groovy/lang/Script
at java.lang.ClassLoader.defineClass1(Native Method)[:1.6.0_24]
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)[:1.6.0_24]
at java.lang.ClassLoader.defineClass(ClassLoader.java:616)[:1.6.0_24]
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)[:1.6.0_24]
at groovy.lang.GroovyClassLoader.access$300(GroovyClassLoader.java:55)
at groovy.lang.GroovyClassLoader$ClassCollector.createClass(GroovyClassLoader.java:519)
at groovy.lang.GroovyClassLoader$ClassCollector.onClassNode(GroovyClassLoader.java:536)
at groovy.lang.GroovyClassLoader$ClassCollector.call(GroovyClassLoader.java:540)
at org.codehaus.groovy.control.CompilationUnit$11.call(CompilationUnit.java:747)
at org.codehaus.groovy.control.CompilationUnit.applyToPrimaryClassNodes(CompilationUnit.java:932)
at org.codehaus.groovy.control.CompilationUnit.doPhaseOperation(CompilationUnit.java:509)
at org.codehaus.groovy.control.CompilationUnit.processPhaseOperations(CompilationUnit.java:487)
at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:464)
at groovy.lang.GroovyClassLoader.doParseClass(GroovyClassLoader.java:306)
at groovy.lang.GroovyClassLoader.parseClass(GroovyClassLoader.java:287)
at groovy.lang.GroovyClassLoader.parseClass(GroovyClassLoader.java:267)
at groovy.lang.GroovyClassLoader.parseClass(GroovyClassLoader.java:214)
at groovy.lang.GroovyClassLoader.parseClass(GroovyClassLoader.java:224)
at org.apache.camel.language.groovy.GroovyLanguage.parseExpression(GroovyLanguage.java:44)
at org.apache.camel.language.groovy.GroovyLanguage.createExpression(GroovyLanguage.java:38)
at org.apache.camel.language.groovy.GroovyLanguage.createExpression(GroovyLanguage.java:27)
at org.apache.camel.component.language.LanguageProducer.process(LanguageProducer.java:41)[68:org.apache.camel.camel-core:2.6.0.fuse-01-09]
at org.apache.camel.impl.converter.AsyncProcessorTypeConverter$ProcessorToAsyncProcessorBridge.process(AsyncProcessorTypeConverter.java:50)[68:org.apache.camel.camel-core:2.6.0.fuse-01-09]
... 92 more
Caused by: java.lang.ClassNotFoundException: groovy.lang.Script
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)[:1.6.0_24]
at java.security.AccessController.doPrivileged(Native Method)[:1.6.0_24]
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)[:1.6.0_24]
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)[:1.6.0_24]
at groovy.lang.GroovyClassLoader.loadClass(GroovyClassLoader.java:696)[134:groovy-all:1.7.5]
at groovy.lang.GroovyClassLoader$InnerLoader.loadClass(GroovyClassLoader.java:449)
at groovy.lang.GroovyClassLoader.loadClass(GroovyClassLoader.java:793)[134:groovy-all:1.7.5]
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)[:1.6.0_24]
... 115 more