I’m building an Android App which have to periodically do something in a Service. And I found that using ScheduledThreadPoolExecutor and ScheduledExecutorService is preferable to Timer. Can anyone explain the difference between ScheduledExecutorService and ScheduledThreadPoolExecutor and which one is mo…
Tag: java
Java – How do I get an image to display?
I have spent a really long time trying to find a way to display an image in a Java program (I’m trying to learn how to make a 2D Java game) an nothing that I’ve tried works. I’m using Eclipse Mars and the latest of everything else. Here is my code: Please, just tell me how to correct the cod…
How to get to the end of a line in android studio
Is there a way to get the cursor to the end of the current line? That is, without using the End key, Ctrl + Left/Right or the mouse. It’s time consuming to get to the end of the line when there’s some code after the cursor. eg. In a strings.xml file, the end tag is automatically generated and afte…
Spring Batch restart persistent jobs after abnormal termination
I have a following Spring Batch Job config: I’m starting the job with a following code: This is my test tasklet: I use H2 database as a persistent storage for my jobs. During the jobs execution I’m terminating my application. Right after application restart I expect that all uncompleted jobs will …
What is the solution for the N+1 issue in JPA and Hibernate?
I understand that the N+1 problem is where one query is executed to fetch N records and N queries to fetch some relational records. But how can it be avoided in Hibernate?
How to setup Struts 2 within existing Eclipse by maintaining other configuration?
I am a novice programmer in using Apache Struts 2 MVC Framework. I want to setup Struts 2 within my existing Eclipse IDE and I don’t want to harm other different works I do in Eclipse. Here is a list of things I do in Eclipse and other related works: I am currently using eclipse ide for Java SE develope…
Is it OK to add default implementations to methods of an interface which represents a listener?
There is a certain library I use in my project. This library has an interface which has about 15 methods. The purpose of this interface is to make it possible to subscribe for some events that are generated in the library. A listener class in application can implement this interface and register itself as a l…
Why does cucumber run @Before in all glue code files
I have a problem with my cucumber tests. It runs the @Before method in all the glue classes. For example. This feature file have one glue code in the MainStepDef.class. The MainStepDef: I have an additional glue file called: OtherStep.class And finally I have my runner class. When I run this I get the runtime…
toString() representation output
I have a bug in the code and believe me I’ve run debugging many times to find what’s wrong with code but cannot understand what is wrong. I have to output the contents of 2d Arraylist. For example, if I do: it outputs me the following: But when I change the fourth value, 3, to higher number, for e…
READ_EXTERNAL_STORAGE permission for Android
I’m trying to access media files (music) on the users device to play them; an easy “hello world”-music player app. I’ve followed some tutorials and they basically give the same code. But it won’t work; it keeps crashing and telling me: Now, this is my manifest file: This is my Ja…