I use Tomcat 7.0.43 with a websocket application. My app works fine in Tomcat 7.0.42 but with 43 I get the following output when I try to access my server on websockets: My browser console shows the following: Here is the access log for that request: What has changed in Tomcat 7.0.43? What do I have to change…
What is the difference between CascadeType.REMOVE and orphanRemoval in JPA?
What’s the difference between and This example is from Java EE Tutorial, but I still don’t understand details. Answer From here:- Cascading Remove Marking a reference field with CascadeType.REMOVE (or CascadeType.ALL, which includes REMOVE) indicates that remove operations should be cascaded autom…
Dragging an undecorated Stage in JavaFX
I would like to have a Stage set to “UNDECORATED” made draggable and minimizable. The problem is that I can’t find a way to do so since the examples I come accross that do this do so via methods inserted inside the main method. I would like to have this done via a method declared in the cont…
Is it a known good practice to use a big try-catch per method in java? [closed]
Closed. This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 9 years ago. Improve this question I’ve been interviewed recently and the interviewer wanted me to…
Java Virtual Machine Heap Tuning Parameters
What would be the effect of setting only -Xms without setting a -Xmx for eg. java -Xms 2048m ? Does setting a high lower value for -Xms mean lesser Heap Fragmentation? Answer Setting -Xms to the estimated heap requirement of your application will speed up start of your application (of course Xms must be <=…
How to assert greater than using JUnit Assert?
I have these values coming from a test and I try I get the java.lang.AssertionError and detailMessage on debugging is null. How can I assert greater than conditions in using JUnit Answer Just how you’ve done it. assertTrue(boolean) also has an overload assertTrue(String, boolean) where the String is the…
Return Java system exit value to bash script
I am trying to get the return value from a java program ( System.exit(1);) into a shell script, but it seems like its returning the jvm exit code, which is always 0, if it doesnt crash. For testing purposes, this is the very first line in my main(). Anyone know how to do this? My bash code: Thanks Answer If
ODBC connection to Access database in 64-bit Windows
I am using this tutorial to create a database connection from a java application to a Microsoft Access 2010 database. The tutorial creates a system dsn in windows, and then connects to that system dsn using the following line of java code: The problem is that, when I click the link to add a new system dsn at:…
When to use ** (double star) in glob syntax within JAVA
Directly from this Java Oracle tutorial: Two asterisks, **, works like * but crosses directory boundaries. This syntax is generally used for matching complete paths. Could anybody do a real example out of it? What do they mean with “crosses directory boundary”? Crossing the directory boundary, I i…
How can I prevent java.lang.NumberFormatException: For input string: “N/A”?
While running my code I am getting a NumberFormatException: How can I prevent this exception from occurring? Answer “N/A” is not an integer. It must throw NumberFormatException if you try to parse it to an integer. Check before parsing or handle Exception properly. Exception Handling or – In…