I’m trying to recursively traverse through my Drive to search some files. The code is working fine when there are limited folders/files but when I target my search to C drive where in I have lots of files it throws Out of Heap memory. Exception in thread “Thread-4” java.lang.OutOfMemoryError…
Distribute Range of Numbers between each threads
Config File I have a config file above in which I have number of threads I want to use and the client instance is able to use ID range from 1 to 1000 and suppose the client threads is set at 10, so each thread would have range of 100 id’s(basically by dividing end range with thread size) that it
get timezone in “+0100” (for example) format
I got lost between the documentation and the numerous time-related questions found by google. What I want is very simple: a string that represents the running timezone in the “[+/-] [number] [number] [number] [number]” format (for instance “+0100”). My current code is: which returns &#…
Java synchronization between different JVMs
The project I am working on would trigger various asynchronous jobs to do some work. As I look into it more these asynchronous jobs are actually being run as separate JVMs (separate java processes). Does it mean I would not be able to use any of the following if I need to synchronize between these processes: …
Running liquibase within Java code
For some reason there’s no documentation on running liquibase inside Java code. I want to generate tables for Unit tests. How would I run it directly in Java? e.g. Answer It should be something like (taken from liquibase.integration.spring.SpringLiquibase source): There are multiple implementation of Re…
Jdbctemplate query for string: EmptyResultDataAccessException: Incorrect result size: expected 1, actual 0
I am using Jdbctemplate to retrieve a single String value from the db. Here is my method. In my scenario it is complete possible to NOT get a hit on my query so my question is how do I get around the following error message. It would seem to me that I should just get back a null instead of
Is it possible to cast a retrieved Class object (via reflection) to an interface?
I have 3 projects in my workspace – A, B, and C which is an Android lib project. A contains an Activity named Atest B contains a class named Btest which implements interface I. C contains the I interface. Both A and B are installed on my Android device. During Atest runtime, i’m executing the next…
EJB 3.0 test client working without maven but not with
here is my problem, I made an EJB with maven and 2 test clients, a test client without maven, only added jnp-client and the EJB to it’s class path, work like a charm a test client using MAVEN, added the EJB through the POM and jnp-client, does not work this is my EJB : it’s POM : this is my
Library method to partition a collection by a predicate
I have a collection of objects that I would like to partition into two collections, one of which passes a predicate and one of which fails a predicate. I was hoping there would be a Guava method to do this, but the closest they come is filter, which doesn’t give me the other collection. I would image th…
How to query data out of the box using Spring data JPA by both Sort and Pageable?
I am trying Spring data JPA in my project. I want to know if there is an out-of-the-box API to query data, by both Sort and Pageable. Of course, I know I can write that method myself, I just want to know if there is an out-of-the-box one. My DAO extends JpaRepository, and I found there are the following metho…