Question

I am having trouble trying to use an imported class from a jar file which is located in the referenced libraries of my project.

So I have a project which has the pydev.jar file in the Referenced Libraries. Pydev.jar contains org.python.pydev.navigator.elements.PythonNode, and I have imported this in one of the Java files. Eclipse does not give an errors when I import and use this in the Java file but when I run the project as an Eclipse application there is a java.lang.NoClassDefFoundError: org/python/pydev/navigator/elements/PythonNode exception being thrown.

Code is trying to cast an ISelection to a PythonNode as below:

IStructuredSelection sel = (IStructuredSelection) 
                                window.getSelectionService().getSelection();

ArrayList<String> testNames = new ArrayList<String>();
Iterator<?> itr = sel.iterator();

String testName = "";
String testSuite = "";

while(itr.hasNext()) {
    PythonNode selectionElement = (PythonNode) itr.next();

    testName = selectionElement.toString();
    testSuite = selectionElement.pythonFile.toString();

    testNames.add(testSuite + "." + testName);
}

If anyone can explain why the Exception is being thrown for the use of the PythonNode class at runtime I would be very appreciative. As far as I can see it is imported correctly as it is visible in the Referenced Libraries.

Answer 1

I think you’re building either Eclipse RCP or Eclipse plugin. Am I right?

If yes, you should put pydev.jar under plugin dependencies. Go to plugin.xml, Runtime and put pydev.jar in the classpath