Question

I’m developing a eclipse plugin rcp and I’m running into a NoClassDefFoundError

 Exception in thread 'Thread-7' java.lang.NoClassDefFoundError: org/jdom/input/SAXBuilder       at org.geonames.WebService.search(WebService.java:783)       at geo.GeocoderGeonames$SearchThread.run(GeocoderGeonames.java:119)   Caused by: java.lang.ClassNotFoundException: org.jdom.input.SAXBuilder       at org.eclipse.osgi.framework.internal.core.BundleLoader.findClassInternal(BundleLoader.java:483)       at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:399)       at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:387)       at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:87)       at java.lang.ClassLoader.loadClass(Unknown Source)       at java.lang.ClassLoader.loadClassInternal(Unknown Source)       ... 2 more 

The class that supposedly cannot be found is in a jar that I have added to the buildpath. I don’t get any compile error etc only this exception when the running application enters the code where this class is needed…

Is there some other place I need to add the jar

Answer 1

After reading this added the jar to the MANIFEST.MF, which solved the problem. As I understand it, eclipse starts several classloaders which only sees what MANIFEST.MF tells them to see and ingnores the build path…