August 2015 – Error Geek

Maven dependencies Nature is not working in Eclipse

If you have enable the maven nature enables via eclipse and still

All maven dependencies are not loading and its not showing up in the libraries then.

Add this entry in your classpath file of project .
Just after JRE entry in your classpath file.

1. Ctrl+Shift+R to open up resource .
2. search .classpath
3 .add entry after JRE.

<classpathentry kind=”con” path=”org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER”/>

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Exception java.lang.NoClassDefFoundError: net/sf/cglib/proxy/CallbackFilter

Exception:

Caused by: java.lang.NoClassDefFoundError: net/sf/cglib/proxy/CallbackFilter
 at org.springframework.beans.factory.support.CglibSubclassingInstantiationStrategy.instantiateWithMethodInjection(CglibSubclassingInstantiationStrategy.java:71)
 at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:75)
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:948)
 ... 13 more
Caused by: java.lang.ClassNotFoundException: net.sf.cglib.proxy.CallbackFilter
 at java.net.URLClassLoader$1.run(Unknown Source)
 at java.net.URLClassLoader$1.run(Unknown Source)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.net.URLClassLoader.findClass(Unknown Source)
 at java.lang.ClassLoader.loadClass(Unknown Source)
 at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
 at java.lang.ClassLoader.loadClass(Unknown Source)
 ... 16 more

Solution:

If you get this exception, that means that you are using the earlier version than Spring 3.2 and missing the libraries for CGLIB.

Beginning Spring 3.2, all net.sf.cglib classes moved to org.springframework.cglib and inline them directly within the spring-core JAR. CGLIB is a Byte Code Generation Library is high level API to generate and transform Java byte code. It is a third part library now merged to the Spring framework itself.

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Exception at org.hibernate.cfg.OneToOneSecondPass.doSecondPass(OneToOneSecondPass)

You might end up with this exception while doing your one to one ,or many to one relationship in hibernate.

Exception:

Exception in thread "main" java.lang.NullPointerException
 at org.hibernate.cfg.OneToOneSecondPass.doSecondPass(OneToOneSecondPass.java:135)
 at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1127)
 at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:296)
 at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1283)
 at com.javatpoint.Test.main(Test.java:13)

To fix correct this exception Check following :

1. Your one to one mapping bean is pointing to correct column.
2. You have configured both table correctly.

Once you have correct these your exception will go away.

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Maven – Pom.xml Issues.

Maven — > pom.xml error resolution

Problem 1. Could not calculate build plan: Plugin org.apache.maven.plugins:maven-jar-plugin:2.3.2 or one of its dependencies could not be resolved.

Soultion :-
1 . Just go to the path

C:Users<username>.m2repositoryorgapachemavenplugins

2. Delete the plugin which is causing the issue .
3. In Eclipse clean and build your project again
4. choose Maven->Update Dependencies.

Problem 2 : Could not transfer artifact org.apache.maven.plugins:maven-resources-plugin:pom:2.5 from/to central (http://repo.maven.apache.org/maven2): The operation was cancelled.

Solution :-
Rightclick on your project in eclipse and choose Maven->Update Dependencies
Choose Force update of snapshot release.