I’m writing a simple Java application using MQ classes for Java with Eclipse. Right now I’m able to browse a remote queue without removing the messages stored. Here is the code of the reading cycle: Main question: After the read message line and before moving the cursor to the next message how can…
In Java, how to pass the objects back to Main thread from worker threads?
In Java, how to pass the objects back to Main thread from worker threads? Take the following codes as an example: How to pass the result back to main’s results[i] ? How about passing this to WorkerThread, so that it could Answer Why don’t you use Callables and an ExecutorService?
How to run a program forever in Java? Is System.in.read() the only way?
I took this code: Does line 33 “System.in.read()” means that it will block until there is input? Will this also work when starting the Java application using UNIX rc script – not manually started from a command line? I’d like to write a Java application to listen for HTTP connections. …
Mongodb avoid duplicate entries
I am newbie to mongodb. May I know how to avoid duplicate entries. In relational tables, we use primary key to avoid it. May I know how to specify it in Mongodb using java? Answer Use an index with the {unique:true} option. You can also do this across multiple fields. See this section in the docs for more det…
How do I get the compact/minified form of pretty-printed JSON in Java?
How do I make Jackson’s build() method pretty-print its JSON output? is an example that pretty-prints the JSON string. I need to take the pretty-printed version of JSON string and then convert it to the compact/minified form. How can it be done? I need to convert this: to this: I tried to remove ‘…
Where is jarsigner?
I have the Android SDK installed on both a Linux machine using open SuSE 12.1. I’ve used both machines to successfully build Android apps many times and sign them both with a debug key for testing and a release key from my own keystore, so it should be somewhere on each machine. Using the command Return…
Difference between sampling and profiling in jVisualVM
VisualVM has two separate tabs for sampling and profiling. What is the difference between sampling and profiling in VisualVM? Answer Sampling means taking lots of thread dumps and analyzing stack traces. This is usually faster, does not require runtime changes in your bytecode (which may break it), but is als…
Error :- java runtime environment JRE or java development kit must be available in order to run eclipse
I tried to run “eclipse-jee-juno-win32-x86_64″ , but it raised the following error ” java runtime environment JRE or java development kit must be available in order to run eclipse. No java virtual machine was found after searching in the folloiwng location …….. “. Baring in…
Rest Assured – can’t POST with Parameters and Body
I’m testing a REST api using Rest Assured. I’m running into an error when trying to POST with both a parameter in the url and body content. This works correctly when testing manually. Removing the parameter form the url is not an option Test Code: Which throws the following error when run Why does…
Getting location of cell in JXTreeTable
How to determine the location of a particular cell in JXTreeTable on screen? Answer not sure, but merging some information gathered on topic. this link shows the way to compute swing component coordinates: Getting coordinates of a component in java this link shows, that JXTreeTable extends JTable:- this link …