Changeset 264 for trunk/JFCMonitor/src/de/ugoe/cs/eventbench/jfcmonitor/JarLauncher.java

Timestamp:

11/29/11 13:55:28 (13 years ago)

Author:

sherbold

Message:

• implemented exception handling for JarLauncher? class

File:

• trunk/JFCMonitor/src/de/ugoe/cs/eventbench/jfcmonitor/JarLauncher.java (modified) (2 diffs)

trunk/JFCMonitor/src/de/ugoe/cs/eventbench/jfcmonitor/JarLauncher.java

@@ -12 +12 @@
 import java.util.jar.Manifest;
 
-// TODO decent exception handling; currently no exception are caught!
 public class JarLauncher {
-        
+
         String workingDir = System.getProperty("user.dir") + "/";
         String jarfile;
         String[] args;
-        
-        String[] classPath = new String[]{};
+
+        String[] classPath = new String[] {};
         String mainClassName = "";
         ClassLoader costumClassLoader;
-        
+
+        public class JarLaunchException extends Exception {
+
+                private static final long serialVersionUID = 1L;
+
+                public JarLaunchException() {
+                        super();
+                }
+
+                public JarLaunchException(String string) {
+                        super(string);
+                }
+
+                public JarLaunchException(Exception e) {
+                        super(e);
+                }
+
+        }
+
         public JarLauncher(String jarfile, String[] args) {
                 this.jarfile = jarfile;
@@ -28 +45 @@
         }
 
-        public void exec() throws FileNotFoundException, IOException, ClassNotFoundException, SecurityException, NoSuchMethodException, IllegalArgumentException, IllegalAccessException, InvocationTargetException, InterruptedException {
-                getInfoFromJar();
-                initClassLoader();
-                startSUT();
+        public void exec() {
+                try {
+                        getInfoFromJar();
+                        initClassLoader();
+                        startSUT();
+                } catch (JarLaunchException e) {
+                        System.err.println("Failure to launch application.");
+                        System.err.println(e.getMessage());
+                }
         }
-        
-        private void getInfoFromJar() throws FileNotFoundException, IOException {
-                JarInputStream jarInputStream = new JarInputStream(new FileInputStream(workingDir+jarfile));
+
+        private void getInfoFromJar() throws JarLaunchException {
+                JarInputStream jarInputStream;
+                try {
+                        jarInputStream = new JarInputStream(new FileInputStream(workingDir
+                                        + jarfile));
+                } catch (FileNotFoundException e) {
+                        throw new JarLaunchException(e);
+                } catch (IOException e) {
+                        throw new JarLaunchException(e);
+                }
                 Manifest manifest = jarInputStream.getManifest();
                 mainClassName = manifest.getMainAttributes().getValue("Main-Class");
-                String jarClassPath = manifest.getMainAttributes().getValue("Class-Path");
+                String jarClassPath = manifest.getMainAttributes().getValue(
+                                "Class-Path");
                 String[] jarClassPathElements = jarClassPath.split(" ");
                 classPath = new String[jarClassPathElements.length];
-                for (int i=0; i<jarClassPathElements.length ; i++) {
-                        classPath[i] = "file:"+workingDir+jarClassPathElements[i];
+                for (int i = 0; i < jarClassPathElements.length; i++) {
+                        classPath[i] = "file:" + workingDir + jarClassPathElements[i];
                 }
         }
-        
-        private void initClassLoader() throws MalformedURLException, SecurityException, NoSuchMethodException, IllegalArgumentException, IllegalAccessException, InvocationTargetException {
+
+        private void initClassLoader() throws JarLaunchException {
                 URLClassLoader classLoader = (URLClassLoader) ClassLoader
                                 .getSystemClassLoader();
-                Method method= URLClassLoader.class.getDeclaredMethod("addURL", new Class[] { URL.class });
+                Method method;
+                try {
+                        method = URLClassLoader.class.getDeclaredMethod("addURL",
+                                        new Class[] { URL.class });
+                } catch (SecurityException e) {
+                        throw new JarLaunchException(
+                                        "addURL method of URLClassLoader not accessible via reflection.");
+                } catch (NoSuchMethodException e) {
+                        throw new JarLaunchException(
+                                        "URLClassLoader does not have addURL method. Should be impossible!!");
+                }
                 method.setAccessible(true);
-                
-                method.invoke(classLoader, new Object[]{new URL("file:"+workingDir+jarfile)});
-                
-                for (String element : classPath) {
-                        method.invoke(classLoader, new Object[]{new URL(element)});
+
+                try {
+                        method.invoke(classLoader, new Object[] { new URL("file:"
+                                        + workingDir + jarfile) });
+                        for (String element : classPath) {
+                                method.invoke(classLoader, new Object[] { new URL(element) });
+                        }
+                } catch (IllegalArgumentException e) {
+                        throw new JarLaunchException(
+                                        "Illegal arguments for addURL method. Should be impossible!!");
+                } catch (MalformedURLException e) {
+                        throw new JarLaunchException(e);
+                } catch (IllegalAccessException e) {
+                        throw new JarLaunchException(
+                                        "addURL method of URLClassLoader not accessible via reflection.");
+                } catch (InvocationTargetException e) {
+                        e.printStackTrace();
                 }
         }
-        
-        private void startSUT() throws ClassNotFoundException, SecurityException, NoSuchMethodException, IllegalArgumentException, IllegalAccessException, InvocationTargetException, InterruptedException {
-                Class<?> mainClass = Class.forName(mainClassName);
-                Method mainMethod = mainClass.getMethod("main", new Class[]{String[].class});
-                mainMethod.invoke(null, new Object[]{args});
+
+        private void startSUT() throws JarLaunchException {
+                Class<?> mainClass;
+                try {
+                        mainClass = Class.forName(mainClassName);
+                } catch (ClassNotFoundException e) {
+                        throw new JarLaunchException("Main class not found: "
+                                        + mainClassName);
+                }
+                Method mainMethod;
+                try {
+                        mainMethod = mainClass.getMethod("main",
+                                        new Class[] { String[].class });
+                } catch (SecurityException e) {
+                        throw new JarLaunchException("Main method not accessible.");
+                } catch (NoSuchMethodException e) {
+                        throw new JarLaunchException("Main method not found.");
+                }
+                try {
+                        mainMethod.invoke(null, new Object[] { args });
+                } catch (IllegalArgumentException e) {
+                        throw new JarLaunchException(
+                                        "Illegal arguments for main method. Should be impossible!!");
+                } catch (IllegalAccessException e) {
+                        throw new JarLaunchException("Main method not accessible.");
+                } catch (InvocationTargetException e) {
+                        throw new JarLaunchException(e);
+                }
         }
 }