They should only be used locally for debugging purposes. Stack traces can consist of different types of information, depending on the platform, framework, or programming language. We can conclude that the recursive calls cause the error and can lead to denial of service (DoS). Additionally, the lines in the stack trace appear to be repeated many times. The full function path ensures that the “Vaadin” code did not produce the exception and the error occurred because of the reason stated in the Java documentation. Note that this exception was being thrown by “”, which is within the Java library itself. Non-return recursive function calls will exhaust all the available stack space, which can consume a high amount of memory. A recursive function is a function that calls itself a number of times until a result is returned. StackOverflowErrorĪt (System.java:705)Īt .run(GetPropertyAction.java:84)Īt .navigateTo (Navigator.java:616)Īt .navigateTo (Navigator.java:573)Īccording to the Java documentation, the “StackOverflowError” exception will be thrown when a recursive function has been called too many times. The following stack trace was originally huge, but it has been shortened for sanity. It appears that the “a6653d3” commit is the only commit that has that code at line 425, as shown below:Īrmed with the date and time of the commit, we can find the closest released version of the framework in the repository “Releases” tab, which is version 7.6.5. We can start looking at the “ServerRpcHandler.java” file of each commit and find which one has the exception string code at line 425. GitHub offers the history of an individual file that and lists all of the changes in the file, known as commits. At the time of writing, the current version of the Vaadin Framework (8.1.0.alpha6) shows that the code appears at line 473 of the “ServerRpcHandler.java” file, which does not match with line 425 in the stack trace above. Both methods allow us to find the piece of code that throws the exception. Using the exception string above, we can either search the repository for this string or navigate to the file by using the file package path and file name. The framework is an open source project and available on GitHub, which allows us to browse through the state of the project at each version and Git commit. Determining the Open Source Software VersionĪt this point, we have package paths, file names, and line numbers, which is enough for us to roughly determine the version of Vaadin web framework. This could aid us in tracking down an exact match for the line of code in the framework file that threw the error. The exception above mentions that legacy variables have been received, and is a worded in a very specific way. Useful exceptions normally come with a descriptive error message of what went wrong or why it happened. However, the exception was thrown by the “Vaadin” web framework rather than the Java library, which means something completely different. IllegalStateException, according to the Java documentation, is normally thrown when a method has been invoked at an illegal or inappropriate time. synchronizedHandleRequest (UidlRequestHandler.java:79) handleRpc (ServerRpcHandler.java:273)Īt com. handleInvocations (ServerRpcHandler.java:425)Īt com. The client-side connector sent these legacy varaibles: Īt com. : Received legacy variable change for (58) which is not a VariableOwner.
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