Get result of compiling a Java source file, within another Java class, using JavaCompiler package

Question

I have the following (simplified) code, within my class, which invokes the Java Compiler to process a given source file:

package test;
import javax.tools.*;

public class SimpleCompileTest {
    public static void main(String[] args) {
        String fileToCompile = "MyClass.java";

        JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
        int compilationResult = compiler.run(null, null, null, fileToCompile);

        if(compilationResult == 0){
            System.out.println("Compilation is successful");
        } else {
            System.out.println("Compilation Failed");
        }
    }
}

The compilation succeeds, but now how can i get the result of MyClass.java, how to run this compiled code.

stackoverflow.com/questions/10480046/…

Nikolay Kuznetsov
– Nikolay Kuznetsov

2012-11-20 11:50:56 +00:00
Commented Nov 20, 2012 at 11:50 — Nikolay Kuznetsov
– Nikolay Kuznetsov, Commented Nov 20, 2012 at 11:50

Hussain Akhtar Wahid 'Ghouri' · Accepted Answer · 2012-11-20 12:38:35Z

0

package javacompiler;
import javax.tools.JavaCompiler;
import javax.tools.ToolProvider;
public class COmpilerHello {
    public static void main(String[] args)
    {
        String s="C:/Users/MariaHussain/Desktop/hussi.java";
        JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
        int result = compiler.run(System.in,System.out,System.err,s);
        System.out.println("Compile result code = " + result);
    }
}

see the various value of result variale like 0,1 2 show the comilation state , whether it is compiled or not

answered Nov 20, 2012 at 12:38

Hussain Akhtar Wahid 'Ghouri'

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Community · Accepted Answer · 2017-05-23 12:28:37Z

0

get JavaFileManager, set location to save .class files and then load it via (custom) class loader:

StandardJavaFileManager stdFileManager = compiler.getStandardFileManager(null, Locale.getDefault(), null);

stdFileManager.setLocation(StandardLocation.CLASS_OUTPUT, Arrays.asList(new File("classDir")));

 + custom classloader

Or without storing: JavaCompiler from JDK 1.6: how to write class bytes directly to byte[] array?

where you get pointed to: https://weblogs.java.net/blog/2008/12/17/how-compile-fly

where the main idea is to use custom MemoryFileManager as JavaFileManager.

edited May 23, 2017 at 12:28

CommunityBot

11 silver badge

answered Jan 25, 2014 at 21:55

user1081638

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