Every time I attempt to perform an operation, I encounter this exception.
(TypeError): b.k.g.E is null stack: TBe([object Object]) ....
What steps can I take to fix this error?
Every time I attempt to perform an operation, I encounter this exception.
(TypeError): b.k.g.E is null stack: TBe([object Object]) ....
What steps can I take to fix this error?
When interpreting the message, it is important to understand that it should be read as "X is null" and "stack: ...", not as "null stack".
To decipher the meaning of TBe, you can refer to the symbolMap generated by GWT. This file can be found in the WEB-INF/deploy directory. Locate the specific symbolMap file corresponding to the permutation your browser is using (its name matches the cache.html file) and search for TBe within it (case sensitive). This will reveal the corresponding method in your Java code, giving you insight into what might be triggering the null reference.
If you are using Chrome, you have the option to pretty-print the JavaScript code in Dev Tools for easier debugging. You can set breakpoints in the TBe function, debug step-by-step, and inspect variables, similar to how you would do in Eclipse or any other IDE when working with Java code.
Keep in mind that with GWT 2.5, SourceMaps are generated, allowing you to view and "debug" your Java code directly from your browser. Further information can be found in this screenshot here, and in the design documentation available here.
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