void run() throws Exception { File classesDir = new File("classes"); classesDir.mkdirs(); writeFile(baseFile, baseText); String[] javacArgs = {"-d", classesDir.getPath(), baseFile.getPath()}; com.sun.tools.javac.Main.compile(javacArgs); writeFile(srcFile, srcText); String[] args = { "-d", "api", "-classpath", classesDir.getPath(), "-package", "p", srcFile.getPath() }; ByteArrayOutputStream baos = new ByteArrayOutputStream(); PrintStream ps = new PrintStream(baos); PrintStream prev = System.err; System.setErr(ps); try { int rc = com.sun.tools.javadoc.Main.execute(args); } finally { System.err.flush(); System.setErr(prev); } String out = baos.toString(); System.out.println(out); String errorMessage = "java.lang.IllegalArgumentException: <clinit>"; if (out.contains(errorMessage)) throw new Exception("error message found: " + errorMessage); }