What is the class path of any given source code?

Question

I am decompiling apks and analyzing their source code using the AST Parser (not working in Eclipse environment). To create the bindings, I need to setEnvironment(), but I don't know what to put as the class path. Would it be the same for each set of source code? What would I use as the class path string for a given project?

Answer 1

Seems like you would have to include the classpath of all the java files you use - by that I mean the jar and your own java files. I do not know if this is your actual problem, because you would have to give more information about it. But in case you are just trying to figure out what goes into the method, I found an example here.

And here the cut out example from the link I posted up:

    String path ="C:\\Users\\pc\\workspace\\asttester\\src\\test\\Apple.java";
    File file = new File(path);
    String str = Util.readFileToString(file);

    ASTParser parser = ASTParser.newParser(AST.JLS8);
    parser.setResolveBindings(true);
    parser.setKind(ASTParser.K_COMPILATION_UNIT);

    parser.setBindingsRecovery(true);

    Map options = JavaCore.getOptions();
    parser.setCompilerOptions(options);

    String unitName = "Apple.java";
    parser.setUnitName(unitName);

    String[] sources = { "C:\\Users\\pc\\workspace\\asttester\\src" }; 
    String[] classpath = {"C:\\Program Files\\Java\\jre1.8.0_25\\lib\\rt.jar"};

    // sources is the source dir of all your java files
    // classpath is the java jar containing all the needed classes
    parser.setEnvironment(classpath, sources, new String[] { "UTF-8"}, true);
    parser.setSource(str.toCharArray());

    CompilationUnit cu = (CompilationUnit) parser.createAST(null);

As you can see from the example above, the method definition is:

public void setEnvironment(String[] classpathEntries,
                       String[] sourcepathEntries,
                       String[] encodings,
                       boolean includeRunningVMBootclasspath)

So, like I said, you need to add all java jars you need at compile time. Otherwise it will not compile java classes to .class files. So you have to verify all your JAVA code you are using is contained in one of the jars you are adding to the classpath. As you now, per default, eclipse always add all JAVA jars to the classpath, when you create a JAVA project.

And to determine where the JAVA file is, you can take a look at this code I found:

Class klass = String.class;
URL location = klass.getResource('/'+klass.getName().replace('.', '/')+".class");

You can get more information on the last one here.