What you need is a class that extends JavaFileObject
import java.net.URI;
import javax.tools.SimpleJavaFileObject;
public class JavaSourceFromString extends SimpleJavaFileObject {
final String code;
public JavaSourceFromString( String name, String code) {
super( URI.create("string:///" + name.replace('.','/')
+ Kind.SOURCE.extension),Kind.SOURCE);
this.code = code;
}
@Override
public CharSequence getCharContent(boolean ignoreEncodingErrors) {
return code;
}
}
Which can be used as follows:
JavaCompiler jc = ToolProvider.getSystemJavaCompiler();
if( jc == null) throw new Exception( "Compiler unavailable");
String code = "public class CustomProcessor { /*custom stuff*/ }";
JavaSourceFromString jsfs = new JavaSourceFromString( "CustomProcessor", code);
Iterable<? extends JavaFileObject> fileObjects = Arrays.asList( jsfs);
List<String> options = new ArrayList<String>();
options.add("-d");
options.add( compilationPath);
options.add( "-classpath");
URLClassLoader urlClassLoader =
(URLClassLoader)Thread.currentThread().getContextClassLoader();
StringBuilder sb = new StringBuilder();
for (URL url : urlClassLoader.getURLs()) {
sb.append(url.getFile()).append(File.pathSeparator);
}
sb.append( compilationPath);
options.add(sb.toString());
StringWriter output = new StringWriter();
boolean success = jc.getTask( output, null, null, options, null, fileObjects).call();
if( success) {
logger.info( LOG_PREFIX + "Class has been successfully compiled");
} else {
throw new Exception( "Compilation failed :" + output);
}
