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    <p>Seems that you are trying to compile Java source file into a class file. That can be done with the Java compiler - the <a href="http://docs.oracle.com/javase/6/docs/technotes/tools/windows/javac.html" rel="nofollow">javac</a> command line program or the tools in the <a href="http://docs.oracle.com/javase/6/docs/api/javax/tools/package-summary.html" rel="nofollow">javax.tools package</a>.</p> <p>ASM is for a different purpose. ASM can be used to create class files on-the-fly, without any source code. Read <a href="http://asm.ow2.org/" rel="nofollow">ASM's documentation</a> to learn about Java bytecode and how to produce and read it with ASM.</p> <p>Here is how a file is compiled using javax.tools package. Or then you could invoke the command line tools using <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Process.html" rel="nofollow">Process</a>. Check the documentation for additional arguments - what classpath to use, where to write the files etc.</p> <pre><code>import javax.tools.JavaCompiler; import javax.tools.ToolProvider; public class TestingCompile { public static void main(String[] args) { JavaCompiler javac = ToolProvider.getSystemJavaCompiler(); int result = javac.run(null, null, null, "C:\\path\\to\\Testing.java"); if (result != 0) { throw new RuntimeException("compile failed: exit " + result); } } } </code></pre> <p>Here is how to create the same class file using ASM, without using the source file. I'm quite sure this is not what you want to be doing - otherwise you wouldn't have had to ask the question. ;)</p> <p>This is just the output of <a href="http://asm.ow2.org/asm33/javadoc/user/org/objectweb/asm/util/ASMifierClassVisitor.html" rel="nofollow">ASMifierClassVisitor</a>, so the bytes would still need to be written to a file or loaded dynamically into the class loader. I used the <code>-debug</code> argument so that ASMifier would show also the source file name and line numbers (the <code>visitSource</code>, <code>visitLineNumber</code> and <code>visitLocalVariable</code> calls are optional, so you could omit them and the related labels if the debug information is not needed).</p> <pre><code>import org.objectweb.asm.*; public class TestingDump implements Opcodes { public static byte[] dump() throws Exception { ClassWriter cw = new ClassWriter(0); FieldVisitor fv; MethodVisitor mv; AnnotationVisitor av0; cw.visit(V1_6, ACC_PUBLIC + ACC_SUPER, "Testing", null, "java/lang/Object", null); cw.visitSource("Testing.java", null); { mv = cw.visitMethod(ACC_PUBLIC, "&lt;init&gt;", "()V", null, null); mv.visitCode(); Label l0 = new Label(); mv.visitLabel(l0); mv.visitLineNumber(1, l0); mv.visitVarInsn(ALOAD, 0); mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "&lt;init&gt;", "()V"); mv.visitInsn(RETURN); Label l1 = new Label(); mv.visitLabel(l1); mv.visitLocalVariable("this", "LTesting;", null, l0, l1, 0); mv.visitMaxs(1, 1); mv.visitEnd(); } { mv = cw.visitMethod(ACC_PUBLIC + ACC_STATIC, "main", "([Ljava/lang/String;)V", null, null); mv.visitCode(); Label l0 = new Label(); mv.visitLabel(l0); mv.visitLineNumber(3, l0); mv.visitFieldInsn(GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;"); mv.visitLdcInsn("Works!"); mv.visitMethodInsn(INVOKEVIRTUAL, "java/io/PrintStream", "println", "(Ljava/lang/String;)V"); Label l1 = new Label(); mv.visitLabel(l1); mv.visitLineNumber(4, l1); mv.visitInsn(RETURN); Label l2 = new Label(); mv.visitLabel(l2); mv.visitLocalVariable("args", "[Ljava/lang/String;", null, l0, l2, 0); mv.visitMaxs(2, 1); mv.visitEnd(); } cw.visitEnd(); return cw.toByteArray(); } } </code></pre>
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    1. POHow to generate class file with java ASM?
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