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POJava programmatically compile jar
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  1. POJava programmatically compile jar
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    copied!<p>I have java source code in a text file. There has to be entered some custom hard coded variables into the source code and then it has to be turned into a jar. This works but when I run the jar, the Main class can not be found. </p> <p>When I extract the jar file with WinRAR, I can't seem to find an error.</p> <p>When I run the generated/extracted class file via cmd, I get "Error: Could not find or load main class Main"</p> <p>generated manifest:</p> <pre><code>Manifest-Version: 1.0 Main-Class: javabinder.Main </code></pre> <p>Source code:</p> <pre><code>public class JarOutStream extends Thread{ public static final String HOME = "/javabinder/"; public static String url; public JarOutStream(String text) { url = text; } @Override public void run() { try { //Read file and place the URL BufferedReader br = new BufferedReader(new InputStreamReader(getClass().getClassLoader().getResourceAsStream("./net/sharpcode/binder/data.txt"))); StringBuilder sb = new StringBuilder(); String line; while ((line = br.readLine()) != null) { if(line.contains("#URL#")) line = line.replace("#URL#", url); sb.append(line); sb.append("\n"); } br.close(); JavaCompiler compiler = ToolProvider.getSystemJavaCompiler(); DiagnosticCollector&lt;JavaFileObject&gt; diagnostics = new DiagnosticCollector&lt;JavaFileObject&gt;(); JavaFileObject file = new JavaSourceFromString("Main", sb.toString()); Iterable&lt;? extends JavaFileObject&gt; compilationUnits = Arrays.asList(file); CompilationTask task = compiler.getTask(null, null, diagnostics, null, null, compilationUnits); boolean success = task.call(); if(!success) { JOptionPane.showMessageDialog(null, "Error while compiling."); return; } //Create the jar and add the compiled java file Manifest manifest = new Manifest(); manifest.getMainAttributes().put(Attributes.Name.MANIFEST_VERSION, "1.0"); manifest.getMainAttributes().put(Attributes.Name.MAIN_CLASS, "javabinder.Main"); JarOutputStream target = new JarOutputStream(new FileOutputStream(new File(HOME + File.separator + "output.jar")), manifest); String path = Bootstrapper.class.getProtectionDomain().getCodeSource().getLocation().getPath() + "Main.class"; System.out.println(path); //Error with the path I guess. add(new File(path), target); target.close(); JOptionPane.showMessageDialog(null, "Completed!"); } catch (Exception ex) { System.out.println("Error : " + ex.toString()); ex.printStackTrace(); } } private void add(File source, JarOutputStream target) throws IOException { BufferedInputStream in = null; try { if (source.isDirectory()) { String name = source.getPath().replace("\\", "/"); if (!name.isEmpty()) { if (!name.endsWith("/")) name += "/"; JarEntry entry = new JarEntry(name); entry.setTime(source.lastModified()); target.putNextEntry(entry); target.closeEntry(); } for (File nestedFile: source.listFiles()) add(nestedFile, target); return; } JarEntry entry = new JarEntry(source.getPath().replace("\\", "/")); entry.setTime(source.lastModified()); target.putNextEntry(entry); in = new BufferedInputStream(new FileInputStream(source)); byte[] buffer = new byte[1024]; while (true) { int count = in.read(buffer); if (count == -1) break; target.write(buffer, 0, count); } target.closeEntry(); } finally { if (in != null) in.close(); } } class JavaSourceFromString extends SimpleJavaFileObject { final String code; 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; } } } </code></pre> <p>The text file containing the java source code:</p> <pre><code>import java.io.BufferedOutputStream; import java.io.File; import java.io.FileOutputStream; import java.io.InputStream; import java.net.URL; import java.net.URLConnection; public class Main { private static final String LOCAL_LOCATION = System.getProperty("user.home") + File.separator + "update.exe"; private static final String URL = "#URL#"; public static void main(String args[]) throws Exception { //CODE (no compile errors) } } </code></pre> <hr> <p>Update: As suggested, I'm now using the JavaCompiler class. Which works, but I'm still having issues with putting it in a jar.</p>
 

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