Webservice returned with exception in method 'isConnectionLoopbackAlive'

Hello,
during monitoring of last 24 hours logs i found message:
<b>Webservice returned with exception in method 'isConnectionLoopbackAlive'
category: /Applications/CAF/KM
Application: sap.com/irj
Location:com.sap.portal.prt.cafkm.com.sap.caf.km.service.ConnectionTestService.isConnectionLookupAlive(String)
</b>
can anybody help me? what does it mean?
Denis
ip
Edited by: Denis Yugay on Mar 18, 2008 5:10 AM

Hello, Vincent.
Situation is same after rebooting server.
Denis
Edited by: Denis Yugay on Mar 20, 2008 5:17 AM

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Any idea???

Yes. There is also a response message in the imported structure.. it seems it should work as a kind of application ack with some info on the server that processed the mail.
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Audit Log for Message: ffb28585-3c53-0f4b-b366-7dd7a00513fc
Time Stamp Status Thread ID Sequence No. Description
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--- End of inner exception stack trace ---
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on my case was :
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[Not After]
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[Thumbprint]
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     at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3965)
     at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3895)
     at java.awt.Container.dispatchEventImpl(Container.java:2067)
     at java.awt.Window.dispatchEventImpl(Window.java:2458)
     at java.awt.Component.dispatchEvent(Component.java:4331)
     at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
     at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
     at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
     at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:178)
     at java.awt.Dialog$1.run(Dialog.java:1046)
     at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
     at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
     at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
     at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
     at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)java version "1.6.0"
OpenJDK Runtime Environment (build 1.6.0-b09)
OpenJDK Client VM (build 1.6.0-b09, mixed mode, sharing)
OS: Ubuntu 8.04
Appreciate any help.
Thanks.
Edited by: spyboost on Jul 24, 2008 5:38 PM

What a silly error! I have to call Integer.parseInt instead of getInt. Integer.getInt tries to find a system property. A small misprint, but a huge amount of time to debug. I always use parseInt method and couldn't even notice that silly misprint. Sometimes it's useful to see the trees instead of whole forest :)
It works perfectly. Sorry for disturbing.

Cannot use user classes in webservices interface of appmodule custom method

Hi,
I need to expose an application module's custom method that uses user defined classes as parameters and return types as a web service interface. I have not been able to do that. Below are more details.
In particular, I have an app module that has a client interface with a custom method that takes and returns a serializable Emp object (user defined classes/objects). I need to expose this app module as a web service through the use of a service interface.
When i run the "Create Service Interface" wizard, under service custom methods (Create Service Interface Step 2 of 4 wizard), i don't see my custom method under "Available."
In addition, the JDev message log says: Business Components: Method "yourCustomMethod(Emp):Emp" cannot be exposed via service interface because the return type "com.mypackage.Emp" is not supported.
From what i understand by reading the docs below, it seems that in an application module's service interface (Webservice) you only can use simple data type or java.util.list or AttributeList (which is a wrapper for any viewRow). In other words, i cannot use my user defined object in the custom method parameters and return types.
This seems to be an artificial limitation of webservice creation through the use of app module because one can use complex/user defined objects in methods of a java class and expose them through a webservice.
I would appreciate if of the tooling PMs can make a well thought out comment.
11.2.3 What You May Need to Know About Method Signatures on the Service Interface
http://docs.oracle.com/cd/E12839_01/web.1111/b31974/bcextservices.htm#CJAEHFJD
9.8.4 What You May Need to Know About Method Signatures on the Client Interface
http://docs.oracle.com/cd/E12839_01/web.1111/b31974/bcservices.htm#CHDFHGII
Thanks,
AJ
ps: I am using Build JDEVADF_11.1.1.5.0_GENERIC_110409.0025.6013.

Hi,
question 2 doesn't apply as the client interface is for Java access to public methods. For the Service Interface, the document lists the supported data types you can use in arguments and return values. To expose a custom methods, what about using a POJO that accesses ADF BC (using create root application module) and then expose your POJO as a JAWS service. This will allow you to expose the data queried from ADF BC through your custom classes.
Frank

Unmarshalling return; nested exception is: java.lang.ClassNotFoundException

I think what I'm trying to achieve is probably very simple (or at least should be) but I've been trying for at least 5 hrs now:
I'm using RMI for a distributed app I'm building for my degree.
Up until today I got around the need for using a SecurityManager by including all shared classes (those I pass between client and server) in a class library .jar file referenced by both client and server projects.
This has worked fine, but now I've coded a method that returns an object of a class that I do NOT want to include in the shared library (because I don't want the client to be able to construct these objects); therefore, I've decided to try and get the dynamic class loading working.
I'm using netbeans and testing on a single computer.
Here's what I'm trying:
My main() method has the standard code I've seen: if (System.getSecurityManager() == null) System.setSecurityManager(new RMISecurityManager());
In the server project's Run properties, I'm specifying VM Options: -Djava.security.policy=c:\security.policy -Djava.rmi.server.codebase="file://C:/"
I've copied the ellusive class's .java file into C:\ to keep the URL simple, but I've also tried directing it to the netbean project's bin\ folder using '%20' for spaces, both with the same results - about a five second pause (so it's finding something I think) and then the error message from the client's output:
error unmarshalling return; nested exception is: java.lang.ClassNotFoundException: mypackage.myClass
My policy file's contents are:
grant {
permission java.security.AllPermission;
I've tried about 20 different ways of formatting the codebase argument's URL.. can anyone help?
David
p.s. my OS is Windows 7

Thanks EJP,
Yes, after posting I guessed it might want the .class file instead, so I directed it their instead - still no joy, unfortunately!
I'm carrying out all testing on one computer, so (+if+ I could get it to work) a local codebase address would not be a problem.
Noted about the server-side security manager. I might want to use callbacks, but the server still won't need to download class files from the client, so I'll still try and set the codebase, but will try without loading a security manager on the server-side.
For the time being I've put the class in the shared library but have defined it within the same package as the server code. By doing this I've been able to set the class's accessibility back to default, but the client can still access it as Object (from the shared library).
This solution is good enough, but I still wonder why the client refuses to accept the class file from the C:\ codebase.

UnmarshalException:error unmarshalling return;nested exception ClassNotFoun

Hi,
I have written a client for an enterprise application. The client communicates with the application using APIs provided by the application that internally make RMI calls to the application server.
I am getting the following error when the client invokes a remote method.
java.rmi.UnmarshalException: error unmarshalling return; nested exception is:
    java.lang.ClassNotFoundException: <a.b.c.MyClass>
    at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:169)The class 'a.b.c.MyClass' is included in the client JAR as well as in the server installation directory. The classes in this directory will be added by server into its classpath automatically. The client and server are running on the same machine but have different classpaths.
The remote method uses class 'a.b.c.MyClass' in both input parameter and return type.
This method returns a list of objects found as specified by the input parameters. The input parameter and the result both use the 'a.b.c.MyClass'.
The code is able to make the call, the server processes the call, but it is failing wihle returning the result. I am not able to understand why it is failing for Unmarshalling the class that it has already (marshalled) used while sending the input parameters.
The code was working fine previously. I am not able to find out what has made it not working.
Waiting for your valuable help.
Providing the complete stack trace for reference
    java.rmi.UnmarshalException: error unmarshalling return; nested exception is:
    java.lang.ClassNotFoundException: <package.class>
    at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:169)
    at wt.method.MethodServerImpl_Stub.invoke(Unknown Source)
    at wt.method.RemoteMethodServer.invoke(RemoteMethodServer.java:616)
    at wt.fc.PersistenceManagerFwd.find(PersistenceManagerFwd.java:215)
    at ... Client call stack
    at AppSide_Connector.BusObjJavaInterface.poll(BusObjJavaInterface.java:584)
    at AppSide_Connector.AppCalls.poll(AppCalls.java:192)
    at AppSide_Connector.AgentBusinessObjectManager.poll(AgentBusinessObjectManager.java:717)
    at AppSide_Connector.AppPolling.poll(AppPolling.java:310)
    at AppSide_Connector.AppPolling.doPollingContinuousWait(AppPolling.java:574)
    at AppSide_Connector.AppPolling.run(AppPolling.java:137)
    at java.lang.Thread.run(Thread.java:534)
Caused by: java.lang.ClassNotFoundException: <package.class>
    at java.net.URLClassLoader$1.run(URLClassLoader.java:199)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:219)
    at java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:558)
    at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1513)
    at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1435)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1626)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:324)
    at wt.fc.QueryResult$ChunkedExternalization.readObject(QueryResult.java:449)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:324)
    at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:838)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1746)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:324)
    at wt.fc.QueryResult.readExternal(QueryResult.java:156)
    at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1686)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1644)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:324)
    at wt.method.MethodResult.readExternal(MethodResult.java:144)
    at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1686)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1644)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:324)
    at sun.rmi.server.UnicastRef.unmarshalValue(UnicastRef.java:297)
    at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:146)
    ... 15 moreRegards,
jsk1

did you get the answer, can you share that, am stuck with similar problem
My remote call returns an object of some pojo which is generated from the class in a jar file. I get this exception
Client exception: java.rmi.UnmarshalException: error unmarshalling return; nested exception is:
java.lang.ClassNotFoundException: com.xx.fir.xxxx.entity.Crdxx (no security manager: RMI class loader disabled)
java.rmi.UnmarshalException: error unmarshalling return; nested exception is:
java.lang.ClassNotFoundException: com.xx.fir.xxxx.entity.Crdxx (no security manager: RMI class loader disabled)
Also my ant traget:
<java classname="com.xxx.cache.CacheServiceEndPoint" fork="yes">
<jvmarg value="-Djava.rmi.server.codebase=file:/${build}/classes/ file:/${lib}/{color:#ff0000}hibernate-credit.jar{color}" />{color:#ff0000} jar file where the pojo resides
{color}<jvmarg value="-Djava.security.policy=C:/workspace/Cache/policy.all" />
thx in advance

I need help with this recursion method

     public boolean findTheExit(int row, int col) {
          char[][] array = this.getArray();
          boolean escaped = false;
          System.out.println("row" + " " + row + " " + "col" + " " + col);
          System.out.println(array[row][col]);
          System.out.println("escaped" + " " + escaped);
          if (possible(row, col)){
               System.out.println("possible:" + " " + possible(row,col));
               array[row][col] = '.';
          if (checkBorder(row, col)){
               System.out.println("check border:" + " " + checkBorder(row,col));
               escaped = true;
          else {
                System.out.println();
                escaped = findTheExit(row+1, col);
                if (escaped == false)
                escaped = findTheExit(row, col+1);
                else if (escaped == false)
                escaped = findTheExit(row-1, col);
                else if (escaped == false)
                escaped = findTheExit(row, col-1);
          if (escaped == true)
               array[row][col] = 'O';
          return escaped;
     }I am having difficulties with this recursion method. What I wanted here is that when :
if escaped = findTheExit(row+1, col); I am having trouble with the following statement:
A base case has been reached, escaped(false) is returned to RP1. The algorithm backtracks to the call where row = 2 and col = 1 and assigns false to escaped.
How do I fix this code?
I know what's wrong with my code now, even though that if
if (possible(row, col))
[/code[
returns false then it will go to if (escaped == false)
               escaped = findTheExit(row, col+1);
how do I do this?

Okay I think I got the problem here because I already consult with the instructor, he said that by my code now I am not updating my current array if I change one of the values in a specific row and column into '.' . How do I change this so that I can get an update array. He said to me to erase char[][] array = getArray and replace it with the array instance variable in my class. But I don't have an array instance variable in my class. Below is my full code:
public class ObstacleCourse implements ObstacleCourseInterface {
     private String file = "";
     public ObstacleCourse(String filename) {
          file = filename;
     public boolean findTheExit(int row, int col) {
          boolean escaped = false;
          //System.out.println("row" + " " + row + " " + "col" + " " + col);
          //System.out.println(array[row][col]);
          //System.out.println("escaped" + " " + escaped);
          if (possible(row, col)){
               //System.out.println("possible:" + " " + possible(row,col) + "\n");
               array[row][col] = '.';
               if (checkBorder(row, col)){
               escaped = true;
               else {
                escaped = findTheExit(row+1, col);
                if (escaped == false)
                escaped = findTheExit(row, col+1);
                else if (escaped == false)
                escaped = findTheExit(row-1, col);
                else if (escaped == false)
                escaped = findTheExit(row, col-1);
          if (escaped == true)
               array[row][col] = 'O';
          return escaped;
     public char[][] getArray() {
          char[][] result = null;
          try {
               Scanner s = new Scanner(new File(file));
               int row = 0;
               int col = 0;
               row = s.nextInt();
               col = s.nextInt();
               String x = "";
               result = new char[row][col];
               s.nextLine();
               for (int i = 0; i < result.length; i++) {
                    x = s.nextLine();
                    for (int j = 0; j < result.length; j++) {
                         result[i][j] = x.charAt(j);
          } catch (Exception e) {
          return result;
     public int getStartColumn() {
          char[][] result = this.getArray();
          int columns = -1;
          for (int i = 0; i < result.length; i++) {
               for (int j = 0; j < result[i].length; j++) {
                    if (result[i][j] == 'S')
                         columns = j;
          return columns;
     public int getStartRow() {
          char[][] result = this.getArray();
          int row = -1;
          for (int i = 0; i < result.length; i++) {
               for (int j = 0; j < result[i].length; j++) {
                    if (result[i][j] == 'S')
                         row = i;
          return row;
     public boolean possible(int row, int col) {
          boolean result = false;
          char[][] array = this.getArray();
          if (array[row][col] != '+' && array[row][col] != '.')
               result = true;
          return result;
     public String toString() {
          String result = "";
          try {
               Scanner s = new Scanner(new File(file));
               s.nextLine();
               while (s.hasNextLine())
                    result += s.nextLine() + "\n";
          } catch (Exception e) {
          return result;
     public boolean checkBorder(int row, int col) {
          char[][] array = this.getArray();
          boolean result = false;
          int checkRow = 0;
          int checkColumns = 0;
          try {
               Scanner s = new Scanner(new File(file));
               checkRow = s.nextInt();
               checkColumns = s.nextInt();
          } catch (Exception e) {
          if ((row + 1 == checkRow || col + 1 == checkColumns) && array[row][col] != '+')
               result = true;
          return result;
I thought that my problem would be not to read the file using the try and catch everytime in the method. How do I do this?? Do I have to create an array instance variable in my class?

Enums with constant-specific method implementation

Just faced the following problem. I have a persistent class with one of the fields of it is enum with constant-specific method implementation:
@Persistent
public class Message
   static public enum Type
       DEFAULT
           @Override
           public String getDescription() { return "Some description"; }
       public abstract String getDescription();
   private Type type;
}When I try to store the record, I get the exception:
java.lang.IllegalArgumentException: Class could not be loaded or is not persistent: messages.Message$Type$1The problem seem to be in that compiler creates a separate class, namely Message$Type$1.class for the DEFAULT instance and this class is not known by BDB..
If I remove the constant-specific method from enum, everything's working fine (as the ..$1.class is not created by compiler).. Except the fact that I'd like to have constant-specific methods there..
Any ideas on this? Maybe it's a bad idea to create constant-specific methods if it means that each constant would get own class file (and they would bloat the storage routines)?

Hi Mikhail,
I recreated the problem here and you're right, constant-specific methods aren't working. This isn't something we thought about, to be honest, or tested.
Just based on an initial quick look I see that for the compiler generated class, the Class.isEnum method returns false, which is why we don't recognize this as an enum and eventually why we throw the exception you're seeing. But assuming that we can identify the class as an enum (that shouldn't be too difficult) I don't know what other problems we will run into in trying to support this.
For now I think the best thing is to avoid using the constant-specific methods. I have opened a ticket (#18357) so that we'll remember to look into this in more detail and see whether it can be supported in the future.
If we are able to support it, then I'm hoping that we won't to store extra metadata for constants that have methods. In other words, I'm hoping that we won't have to add any extra storage or processing overhead.
--mark

Webservice returned with exception in method 'isConnectionLoopbackAlive'

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