more stub methods for native replacements

Author: Horcrux7

src/de/inetsoftware/jwebassembly/api/java/lang/ReplacementForClassLoader.java

@@ -31,4 +31,12 @@ class ReplacementForClassLoader {
     private static void registerNatives() {
         // nothing
     }
+
+    /**
+     * Replacement for getSystemClassLoader();
+     */
+    @Replace( "java/lang/ClassLoader.getSystemClassLoader()Ljava/lang/ClassLoader;" )
+    public static ClassLoader getSystemClassLoader() {
+        return null;
+    }
 }

src/de/inetsoftware/jwebassembly/api/java/lang/ReplacementForThread.java

@@ -32,7 +32,7 @@ class ReplacementForThread {
     @Replace( "java/lang/Thread.currentThread()Ljava/lang/Thread;" )
     static Thread currentThread() {
         if( current == null ) {
-            new Thread( "main" );
+            current = new Thread( "main" );
         }
         return current;
     }
@@ -44,6 +44,14 @@ static Thread currentThread() {
     static void registerNatives() {
     }
 
+    /**
+     * Replacement for holdsLock().
+     */
+    @Replace( "java/lang/Thread.holdsLock(Ljava/lang/Object;)Z" )
+    public static boolean holdsLock(Object obj) {
+        return true;
+    }
+
     /**
      * Replacement for setPriority0().
      */

src/de/inetsoftware/jwebassembly/api/java/lang/ReplacementForThrowable.java

@@ -39,4 +39,20 @@ class ReplacementForThrowable {
     private static Throwable fillInStackTrace( Throwable this_ ) {
         return this_;
     }
+
+    /**
+     * Replacement for getStackTraceDepth()
+     */
+    @Replace( "java/lang/Throwable.getStackTraceDepth()I" )
+    private int getStackTraceDepth() {
+        return 0;
+    }
+
+    /**
+     * Replacement for getStackTraceElement(int)
+     */
+    @Replace( "java/lang/Throwable.getStackTraceElement(I)Ljava/lang/StackTraceElement;" )
+    StackTraceElement getStackTraceElement(int index) {
+        return null;
+    }
 }