Question

Here is the error I am getting:

java.lang.NoSuchMethodError: com.Order.getList(Lepo/User;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)Ljava/util/ArrayList;

After decompiling the classes, I found that there should be a “Ljava/lang/String” as the first parameter. As you can see by the error that parameter is missing. So I decompiled the calling method’s class and it does a have a string as the first parameter.

This is where I am a little confused to what is happening here. The last time this code was modified was 2007 according to the timestamps. This error showed up about a week ago.

This is a struts app running on JBoss 4.0.0DR3. To my knowledge there has been no software upgrades on the server.

I also tried stopping JBoss, deleting all the temp directories and restarting.

Does anyone have any suggestions to the next step to take?

Edit:

Here is more of the stacktrace

java.lang.NoSuchMethodError: com.Order.getList(Lepo/User;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)Ljava/util/ArrayList;
    at com.ViewStatusAction.retrieveList(ViewStatusAction.java:325)
    at com.ViewStatusAction.executeAction(ViewStatusAction.java:115)
    at com.BaseAction.execute(BaseAction.java:42)
    at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)

Answer 1

I’m assuming that both the com.Order and com.ViewStatusAction are application code, not 3rd-party code.

The exception means that you have a version mismatch of some kind.

• The ViewStatusAction class expects there to be a method in Order with this signature:

  java.util.ArrayList getList(Lepo.User arg0, 
                              String arg1, String arg2, 
                              String arg3, String arg4)
  

• The Order class does not declare a method with that signature. (It may have a different signature, or it may not exist at all.)

When you originally compiled ViewStatusAction, the compiler was able to find that method. However now, the runtime system cannot find it any more. This can only mean that you are using a different version of Order to the one that your ViewStatusAction class was compiled against.

You need to find out why you’ve now got this mismatch. Possible explanations include:

• You have deployed a new version of one of the classes without deploying the new version of the other.

• You have deployed an out of date version of one of the classes.

• You have two versions of one or other of the classes on your class path and you have unwittingly changed the classpath search order.

What you need to do is find out where the incompatible classes are coming from, and how they got there. Once you have figured that out, the fix is likely to be self evident.

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I note that your FQ class names doen’t conform to accepted standards:

1. The package names should start with your organisation’s domain name, reversed. “com.” is wrong.
2. The package names should be all lower-case. “Lepo” is wrong if it is a package name, and if it is a class in the default package, then that is wrong too.

(It is possible that your problem might be a fall-out of fixing the bogus Lepo.User name …)