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Spring MVC: How to perform validation?
...ModelAttribute("user") User user, BindingResult result){
if (result.hasErrors()){
// do something
}
else {
// do something else
}
}
Notice the @Valid : if the user happens to have a null name, result.hasErrors() will be true.
Method 2 : If you have complex validation (...
Activity has leaked window that was originally added
What is this error, and why does it happen?
40 Answers
40
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Stop and Start a service via batch or cmd file?
How can I script a bat or cmd to stop and start a service reliably with error checking (or let me know that it wasn't successful for whatever reason)?
...
java.lang.UnsupportedClassVersionError: Bad version number in .class file?
I am getting this error when I include an opensource library that I had to compile from source. Now, all the suggestions on the web indicate that the code was compiled in one version and executed in another version (new on old). However, I only have one version of JRE on my system. If I run the c...
Push origin master error on new repository
... started using git with github. I followed their instructions and ran into errors on the last step. I'm checking in an existing directory that isn't currently source-controlled (project about a week old). Other than that, my use case should be pretty run of the mill.
...
ValueError: numpy.dtype has the wrong size, try recompiling
...smodels package on my python 2.7
When I tried "import pandas as pd", this error message comes out.
Can anyone help? Thanks!!!
...
Meaning of Android Studio error: Not annotated parameter overrides @NonNull parameter
...te MyActivity class, when I try to commit the code to Git, I get a strange error I don't understand. The code is this:
3 An...
“Debug certificate expired” error in Eclipse Android plugins
...am using Eclipse Android plugins to build a project, but I am
getting this error in the console window:
17 Answers
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What does set -e mean in a bash script?
...ended to use:
trap 'do_something' ERR
to run do_something function when errors occur.
See http://mywiki.wooledge.org/BashFAQ/105
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Cannot add or update a child row: a foreign key constraint fails
...
You're getting this error because you're trying to add/update a row to table2 that does not have a valid value for the UserID field based on the values currently stored in table1. If you post some more code I can help you diagnose the specific c...