title: Is it possible to call a Java extension function from Xalan on Android?
body: <p>docx4j uses Xalan to convert docx to HTML, and relies heavily on Xalan Java extensions to do the work.</p>
  
  <p>But Xalan extensions don't work for me on Android (working with 4.0.3). LogCat says:</p>
  
  <pre><code>05-14 15:38:02.840: I/dalvikvm(7249): DexOpt: illegal method access (call Lorg/apache/xalan/extensions/ExtensionHandler;.getClassForName (Ljava/lang/String;)Ljava/lang/Class; from Lorg/apache/xalan/extensions/ExtensionHandlerJavaPackage;)
  05-14 15:38:02.840: I/dalvikvm(7249): Could not find method org.apache.xalan.extensions.ExtensionHandler.getClassForName, referenced from method org.apache.xalan.extensions.ExtensionHandlerJavaPackage.callFunction
  05-14 15:38:02.840: W/dalvikvm(7249): VFY: unable to resolve static method 21489: Lorg/apache/xalan/extensions/ExtensionHandler;.getClassForName (Ljava/lang/String;)Ljava/lang/Class;
  05-14 15:38:02.840: D/dalvikvm(7249): VFY: replacing opcode 0x71 at 0x0096
  05-14 15:38:02.840: I/dalvikvm(7249): Could not find method org.apache.xalan.transformer.TransformerImpl.getDebug, referenced from method org.apache.xalan.extensions.ExtensionHandlerJavaPackage.callFunction
  05-14 15:38:02.840: W/dalvikvm(7249): VFY: unable to resolve virtual method 23717: Lorg/apache/xalan/transformer/TransformerImpl;.getDebug ()Z
  05-14 15:38:02.840: D/dalvikvm(7249): VFY: replacing opcode 0x74 at 0x0133
  05-14 15:38:02.840: I/dalvikvm(7249): DexOpt: illegal method access (call Lorg/apache/xalan/extensions/ExtensionHandler;.getClassForName (Ljava/lang/String;)Ljava/lang/Class; from Lorg/apache/xalan/extensions/ExtensionHandlerJavaPackage;)
  05-14 15:38:02.840: I/dalvikvm(7249): Could not find method org.apache.xalan.extensions.ExtensionHandler.getClassForName, referenced from method org.apache.xalan.extensions.ExtensionHandlerJavaPackage.callFunction
  05-14 15:38:02.840: W/dalvikvm(7249): VFY: unable to resolve static method 21489: Lorg/apache/xalan/extensions/ExtensionHandler;.getClassForName (Ljava/lang/String;)Ljava/lang/Class;
  05-14 15:38:02.840: D/dalvikvm(7249): VFY: replacing opcode 0x71 at 0x0189
  05-14 15:38:02.840: I/dalvikvm(7249): Could not find method org.apache.xalan.transformer.TransformerImpl.getDebug, referenced from method org.apache.xalan.extensions.ExtensionHandlerJavaPackage.callFunction
  05-14 15:38:02.840: W/dalvikvm(7249): VFY: unable to resolve virtual method 23717: Lorg/apache/xalan/transformer/TransformerImpl;.getDebug ()Z
  05-14 15:38:02.840: D/dalvikvm(7249): VFY: replacing opcode 0x74 at 0x028e
  05-14 15:38:02.840: I/dalvikvm(7249): DexOpt: illegal method access (call Lorg/apache/xalan/extensions/ExtensionHandler;.getClassForName (Ljava/lang/String;)Ljava/lang/Class; from Lorg/apache/xalan/extensions/ExtensionHandlerJavaPackage;)
  05-14 15:38:02.840: I/dalvikvm(7249): Could not find method org.apache.xalan.extensions.ExtensionHandler.getClassForName, referenced from method org.apache.xalan.extensions.ExtensionHandlerJavaPackage.isElementAvailable
  05-14 15:38:02.840: W/dalvikvm(7249): VFY: unable to resolve static method 21489: Lorg/apache/xalan/extensions/ExtensionHandler;.getClassForName (Ljava/lang/String;)Ljava/lang/Class;
  05-14 15:38:02.840: D/dalvikvm(7249): VFY: replacing opcode 0x71 at 0x0022
  05-14 15:38:02.840: I/dalvikvm(7249): DexOpt: illegal method access (call Lorg/apache/xalan/extensions/ExtensionHandler;.getClassForName (Ljava/lang/String;)Ljava/lang/Class; from Lorg/apache/xalan/extensions/ExtensionHandlerJavaPackage;)
  05-14 15:38:02.840: I/dalvikvm(7249): Could not find method org.apache.xalan.extensions.ExtensionHandler.getClassForName, referenced from method org.apache.xalan.extensions.ExtensionHandlerJavaPackage.isFunctionAvailable
  05-14 15:38:02.840: W/dalvikvm(7249): VFY: unable to resolve static method 21489: Lorg/apache/xalan/extensions/ExtensionHandler;.getClassForName (Ljava/lang/String;)Ljava/lang/Class;
  05-14 15:38:02.840: D/dalvikvm(7249): VFY: replacing opcode 0x71 at 0x0021
  05-14 15:38:02.840: I/dalvikvm(7249): DexOpt: illegal method access (call Lorg/apache/xalan/extensions/ExtensionHandler;.getClassForName (Ljava/lang/String;)Ljava/lang/Class; from Lorg/apache/xalan/extensions/ExtensionHandlerJavaPackage;)
  05-14 15:38:02.840: I/dalvikvm(7249): Could not find method org.apache.xalan.extensions.ExtensionHandler.getClassForName, referenced from method org.apache.xalan.extensions.ExtensionHandlerJavaPackage.processElement
  05-14 15:38:02.840: W/dalvikvm(7249): VFY: unable to resolve static method 21489: Lorg/apache/xalan/extensions/ExtensionHandler;.getClassForName (Ljava/lang/String;)Ljava/lang/Class;
  05-14 15:38:02.840: D/dalvikvm(7249): VFY: replacing opcode 0x71 at 0x004c
  05-14 15:38:02.840: I/dalvikvm(7249): Could not find method org.apache.xalan.transformer.TransformerImpl.getDebug, referenced from method org.apache.xalan.extensions.ExtensionHandlerJavaPackage.processElement
  05-14 15:38:02.840: W/dalvikvm(7249): VFY: unable to resolve virtual method 23717: Lorg/apache/xalan/transformer/TransformerImpl;.getDebug ()Z
  05-14 15:38:02.840: D/dalvikvm(7249): VFY: replacing opcode 0x74 at 0x0091
  05-14 15:38:02.860: D/AndroidRuntime(7249): Shutting down VM
  05-14 15:38:02.860: W/dalvikvm(7249): threadid=1: thread exiting with uncaught exception (group=0x40a531f8)
  05-14 15:38:02.860: E/AndroidRuntime(7249): FATAL EXCEPTION: main
  05-14 15:38:02.860: E/AndroidRuntime(7249): java.lang.IllegalAccessError: tried to access method org.apache.xalan.extensions.ExtensionHandler.getClassForName:(Ljava/lang/String;Ljava/util/Vector;Ljava/lang/Object;Lorg/apache/xalan/extensions/ExpressionContext;)Ljava/lang/Object; from class org.apache.xalan.extensions.ExtensionHandlerJavaPackage
  05-14 15:38:02.860: E/AndroidRuntime(7249):  at org.apache.xalan.extensions.ExtensionHandlerJavaPackage.callFunction(ExtensionHandlerJavaPackage.java:315)
  05-14 15:38:02.860: E/AndroidRuntime(7249):  at org.apache.xalan.extensions.ExtensionHandlerJavaPackage.callFunction(ExtensionHandlerJavaPackage.java:440)
  05-14 15:38:02.860: E/AndroidRuntime(7249):  at org.apache.xalan.extensions.ExtensionsTable.extFunction(ExtensionsTable.java:222)
  05-14 15:38:02.860: E/AndroidRuntime(7249):  at org.apache.xalan.transformer.TransformerImpl.extFunction(TransformerImpl.java:417)
  05-14 15:38:02.860: E/AndroidRuntime(7249):  at org.apache.xpath.functions.FuncExtFunction.execute(FuncExtFunction.java:208)
  05-14 15:38:02.860: E/AndroidRuntime(7249):  at org.apache.xpath.XPath.execute(XPath.java:337)
  05-14 15:38:02.860: E/AndroidRuntime(7249):  at org.apache.xalan.templates.ElemVariable.getValue(ElemVariable.java:274)
  05-14 15:38:02.860: E/AndroidRuntime(7249):  at org.apache.xalan.templates.ElemVariable.execute(ElemVariable.java:245)
  05-14 15:38:02.860: E/AndroidRuntime(7249):  at org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(ElemApplyTemplates.java:370)
  05-14 15:38:02.860: E/AndroidRuntime(7249):  at org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTemplates.java:175)
  05-14 15:38:02.860: E/AndroidRuntime(7249):  at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2223)
  05-14 15:38:02.860: E/AndroidRuntime(7249):  at org.apache.xalan.transformer.TransformerImpl.applyTemplateToNode(TransformerImpl.java:2096)
  05-14 15:38:02.860: E/AndroidRuntime(7249):  at org.apache.xalan.transformer.TransformerImpl.transformNode(TransformerImpl.java:1228)
  05-14 15:38:02.860: E/AndroidRuntime(7249):  at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:614)
  05-14 15:38:02.860: E/AndroidRuntime(7249):  at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:1145)
  05-14 15:38:02.860: E/AndroidRuntime(7249):  at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:1123)
  05-14 15:38:02.860: E/AndroidRuntime(7249):  at org.docx4j.XmlUtils.transform(XmlUtils.java:841)
  05-14 15:38:02.860: E/AndroidRuntime(7249):  at org.docx4j.XmlUtils.transform(XmlUtils.java:734)
  05-14 15:38:02.860: E/AndroidRuntime(7249):  at org.docx4j.convert.out.html.HtmlExporterNG2.html(HtmlExporterNG2.java:269)
  05-14 15:38:02.860: E/AndroidRuntime(7249):  at com.example.HelloAndroid.HelloAndroid.onCreate(HelloAndroid.java:58)
  05-14 15:38:02.860: E/AndroidRuntime(7249):  at android.app.Activity.performCreate(Activity.java:4465)
  05-14 15:38:02.860: E/AndroidRuntime(7249):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
  05-14 15:38:02.860: E/AndroidRuntime(7249):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
  05-14 15:38:02.860: E/AndroidRuntime(7249):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
  05-14 15:38:02.860: E/AndroidRuntime(7249):  at android.app.ActivityThread.access$600(ActivityThread.java:123)
  05-14 15:38:02.860: E/AndroidRuntime(7249):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
  05-14 15:38:02.860: E/AndroidRuntime(7249):  at android.os.Handler.dispatchMessage(Handler.java:99)
  05-14 15:38:02.860: E/AndroidRuntime(7249):  at android.os.Looper.loop(Looper.java:137)
  05-14 15:38:02.860: E/AndroidRuntime(7249):  at android.app.ActivityThread.main(ActivityThread.java:4424)
  05-14 15:38:02.860: E/AndroidRuntime(7249):  at java.lang.reflect.Method.invokeNative(Native Method)
  05-14 15:38:02.860: E/AndroidRuntime(7249):  at java.lang.reflect.Method.invoke(Method.java:511)
  05-14 15:38:02.860: E/AndroidRuntime(7249):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
  05-14 15:38:02.860: E/AndroidRuntime(7249):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
  05-14 15:38:02.860: E/AndroidRuntime(7249):  at dalvik.system.NativeStart.main(Native Method)
  </code></pre>
  
  <p>Any thoughts on what the problem is exactly, and workarounds?</p>