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Tag: java

Spring fails to inject entity manager factory

I writing tests for my DAO classes using JPA, with Hibernate as JPA provider, and Spring 3.2. I am not able to inject the entity manager correctly, I get a NullPointerException when trying to access it. My GenericDAO implementation looks like this: The class of the test looks like this: My root-context.xml is…

JUnit Tests for GUI in Java

I would like to write test cases for a GUI. I want to know how do you simulate a click of JButton, or how do you extract the elements of a JTable. For the purpose of this, I have built a simple GUI that increase the count by 1 if the button is clicked and the JTextfield is empty, but

How to use named parameter in plain sql with jooq

I’m using JOOQ with plain/raw SQL, so that means i’m not using any code generation or the fluid DSL thingy. The following code works: Now let’s say i have a query with multiple parameters like this: How do i use a named parameter with these types of queries? I’m thinking something like…

Switch listener in ListView giving wrong results

Here is my Array adapter. It assigns each switch button in the list with a listener that is dependant on the id given by the database (passed using devices.id). But for some reason, the switch listener is getting the correct states from the switches. For debugging purpose, I’m just using the same on cha…

BasicFileAttributes vs BasicFileAttributeView in Java

What is the difference between these two interfaces? BasicFileAttributes vs BasicFileAttributeView I understand that they serve to retrieve basic metadata from a file, but what actually differs from each other? EDIT: I previously meant that in the following example the 2 interfaces are used interchangeably. I…

Resize a picture to fit a JLabel

I’m trying to make a picture fit a JLabel. I wish to reduce the picture dimensions to something more appropriate for my Swing JPanel. I tried with setPreferredSize but it doesn’t work. I’m wondering if there is a simple way to do it? Should I scale the image for this purpose? Answer Outline …

ApplicationInfo metadata returning null

I have the following code: In the manifest: In the code: But the result is ai.metaData==null. Why is this happening Answer From the latest android doc, <meta-data> can be only contained in <activity>/<activity-alias>/<service>/ <receiver>. So you should append meta-data in these …