Prevents usage of synchronized methods

SynchronizedRemover.groovy

import org.codehaus.groovy.control.CompilerConfiguration
import org.codehaus.groovy.syntax.SyntaxException
import org.codehaus.groovy.ast.ClassNode
import org.codehaus.groovy.control.SourceUnit
import org.codehaus.groovy.classgen.GeneratorContext

class SynchronizedRemover extends org.codehaus.groovy.control.customizers.CompilationCustomizer {
    SynchronizedRemover() {
        super(org.codehaus.groovy.control.CompilePhase.CONVERSION)
    }
    
    void call(final SourceUnit source, final GeneratorContext context, final ClassNode classNode) {
        classNode.methods.each { mn ->
            if (mn.modifiers & 0x0020) { // 0x0020 is for synchronized
                source.addError(new SyntaxException("Synchronized is not allowed", mn.lineNumber, mn.columnNumber))
            }
        }
    }
}

def config = new CompilerConfiguration()
config.addCompilationCustomizers(new SynchronizedRemover())

def shell = new GroovyShell(config)
shell.evaluate '''
    class Foo { public synchronized void foo() { println 'bar' } }
'''