Develop Reference

appengine data nucleus enhancer issue with classes not getting enhanced

I have a appengine web app that keeps giving me a class not enhanced error... Whenever I try to log into the app from the login page I get the following error
Caused by: org.datanucleus.exceptions.NucleusUserException: Found Meta-Data for class com.d.su.model.Resource but this class is not enhanced!! Please enhance the class before running DataNucleus.
i've googled quite a bit and it seems to be an issue with data nucleus enhancer not running on all classes. i;m using eclipse with the google plugin, I tried it on two different versions of the appengine SDK but no luck... Any idea how I can go about resolving this?

Sometimes while changing app engine sdk, jars are not completely removed from previous version, so check if your webapps/lib have same jars of multiple version if so then delete all jars from webapps/lib then change appengine version.
Clean and refresh project, make sure lib have only default jars

Windows Service starting Java not working since Java Upgrade to 8

We've updated our buildserver (Atlassian Bamboo) to Java 8 (JDK).
Since then our integrationtests are failing because our started product does not open any port.
We are building with maven and as part of the integrationtest we are starting our builded product. Our product is a Rest-Api based in an OSGI (equinox) and Jetty.
I tried a lot of things, but nothing helped me to get the product start properly in the maven build.
When I log in on my remote machine and start the product manually everything works fine.
Some more information:
Our buildserver runs as a windows service and our product is written in plain Java.

Presumably you are affected by one or more of the issues discussed in Custom AMIs will not start anymore in Bamboo Cloud (BAM-16291), notably that Bamboo is not compatible with JDK8u60 yet:
Joda-time, one of the libraries used by Bamboo is not compatible with
8u60. We've fixed this problem, but the fix has not been rolled out
yet. Known breakages include S3 interaction and CodeDeploy plugin.
Most/All participants got things working again by downgrading to JDK8u45, as also recommended in Atlassian's most recent update:
Use JDK 8u45. The latest JDKs are incompatible with some 3rd party libraries we're using.
Try to match the layout and scripts of our stock images as closely as possible. This will make it easier for us to provide help if
anything goes wrong.
Choose Oracle if you have the choice between Oracle and OpenJDK flavor of JDK.

Spring Batch Admin - Override configurations are not recognized

I have downloaded the spring-batch-admin 1.3.0.RELEASE project, and updated all of the library references to the most recent RELEASE versions so that they are compatible with my spring-batch environment (eg. spring-xxx 4.1.4.RELEASE).
I have applied the environment settings and overrides per http://docs.spring.io/spring-batch-admin/getting-started.html . However, those overrides are not being recognized.
At least one email chain linked this symptom to the jira issues linked to https://jira.spring.io/browse/SPR-12111 , but those are allegedly fixed in spring core 4.1 .
Since the problem appears to be that the XML files in the project are not being scanned at all (only the ones embedded in the jar files), it seems to me that here should be some obvious way to work around this, even if it is not technically a "fix".
I am open for suggestions.

I resolved this by downloading the latest 1.3.1.RELEASE source from github and building it without any modifications.

How to install play2War plugin (Play Framework 2.1.1.)

I'd be very grateful if someone could provide me the basic steps to install the Play2War Plugin. Like where to put the plugin files?, and which files?
I'm pretty new with Play Framework (Java, I'm not a Scala developer, ...yet), just created my first application, and want to deploy it on my server, with is a CentOS with Tomcat/ Glassfish installed, but unfortunately I found out that the 2.x version didn't have the built in war command anymore. I scoured the documentation and found the links Configuration, Usage and Deployment, but what I want to know are the steps until get there.
I started looking for sbt building tool ('cause Play2War Plugin uses it), until I realize that Play Framework 2.1.1. already have it installed (at least that is what I believe. See: *PLAY_HOME/framework/sbt/sbt-launch.jar* and *PLAY_HOME/framework/build*). Am I correct?
Thanks in advance,

As Play 2.1.1 already has SBT its as simple as doing the following:
Within plugins.sbt add:
addSbtPlugin("com.github.play2war" % "play2-war-plugin" % "1.0")
Then within the Build.scala file add:
import com.github.play2war.plugin._
...
val main = play.Project(appName, appVersion, appDependencies)
.settings(Play2WarPlugin.play2WarSettings: _*)
.settings(Play2WarKeys.servletVersion := "X.X")
The X.X needs to be changed to the required Java Servlet version (usually 3.0 or 2.5 depending on your container)

If you have a working play application, you are already using SBT tools to build. Yes, SBT comes with play.
The play2war plugin tutorial provides a step-by-step instruction. Simply follow the tutorial, you should be fine.
To answer your question, where to put the plugin file?
As the tutorial suggests, you need to modify files like APP_HOME/project/plugins.sbt, APP_HOME/project/Build.scala. You should already have these files, you simply need to add those lines to these existing files.
If you have a specific problem, please provide the error message.

What are the Working versions of Jars required in the Compilation of a report made with iReport 4.1.3

i made a couple of Reports using iReport 4.1.3 and i want to compile them through a java application.
but i don't know exactly the version of the jars that works with iReport 4.1.3.
i'm using the following jars :
commons-beanutils-core-1.8.0
commons-collections-3.1
commons-digester-2.0
commons-logging-1.1.1
groovy-all-1.0-jsr-02
itext-1.1.4
jasperreports- 3.1.4
and i get this Error while creating the reports from the Java Application :
Exception in thread "main"java.lang.NoSuchMethodError:com.lowagie.text.pdf.PdfWriter.setRgbTransparencyBlending(Z)V
so, can you please help, by Providing versions, or links.
Thank you very much for your time.

I use iText 2.1.5, in which com.lowagie.text.pdf.PdfWriter.setRgbTransparencyBlending(Z)V
is available.

As per your error, certainly problem is with your iText jar. Try out with the latest version of iText.