javajava-compiler-apijsr199

how to run code compiled by JavaCompiler?


Is there any way to run program compiled by JavaCompiler? [javax.tools.JavaCompiler]

My code:

JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
    DiagnosticCollector<JavaFileObject> diagnostics = new DiagnosticCollector<JavaFileObject>();
    CompilationTask task = compiler.getTask(null, null, diagnostics, null, null, prepareFile(nazwa, content));
    task.call();

    List<String> returnErrors = new ArrayList<String>();
    String tmp = new String();
    for (Diagnostic diagnostic : diagnostics.getDiagnostics()) {
        tmp = String.valueOf(diagnostic.getLineNumber());
        tmp += " msg: "+ diagnostic.getMessage(null);
        returnErrors.add(tmp.replaceAll("\n", " "));
    }

Now i want to run that program with lifetime 1 sec and get output to string variable. Is there any way i could do that?


Solution

  • You need to use reflection, something like that:

    // Obtain a class loader for the compiled classes
    ClassLoader cl = fileManager.getClassLoader(CLASS_OUTPUT);
    // Load the compiled class
    Class compiledClass = cl.loadClass(CLASS_NAME);
    // Find the eval method
    Method myMethod = compiledClass.getMethod("myMethod");
    // Invoke it
    return myMethod.invoke(null);
    

    Adapt it of course to suit your needs