Summary of issues encountered in Java permissions

has been doing Itoojava permissions, to do this part, come up with a lot of problems, these problems because have not done before, a little weak. A lot of problems, after all, it is not difficult to understand.

I have been recording errors in my OneNote, for the subsequent study to provide information, these problems are generally met to solve, the next time there is no problem, after finishing a feeling, the project package is very good, a novice come up, and no not much effort can quickly join the project, And the project has a good package, the general code is not required to move.

Look at the error:

11:27:40,412 error[org.apache.catalina.core.containerbase.[ Jboss.web]. [Default-host]. [/itoo-authority-start-web]] (Serverservice Thread Pool--56) Jbweb000289:servlet action threw load () exception:javax.naming.namenotfoundexception:itoo-authority-role-ear/ itoo-authority-role-core-0.0.1-snapshot/rolebeanimpl!com.tgb.itoo.authority.service.rolebean-- Servicejboss.naming.context.java.global.itoo-authority-role-ear. " Itoo-authority-role-core-0.0.1-snapshot "." Rolebeanimpl!com.tgb.itoo.authority.service.rolebean "

This problem name can not be found, in fact, in the Maven warehouse is not Rolebean, generally no, in Maven we will empty the warehouse, after the regeneration is good, if not, then more directly, in JBoss deployment of this bean can be.

15:11:57,581 error[org.apache.catalina.core.containerbase.[ Jboss.web]. [Default-host]. [/itoo-authority-start-web]. [Action]] (http-/0.0.0.0:8091-9) JBWEB000236:Servlet.service () for Servlet action threwexception:java.lang.ClassCastException: [Ljava.lang.Object; Cannot be cast tocom.tgb.itoo.authority.entity.Notice

Unable to map out the notice entity class, notice the table in the corresponding database Ta_notice, which we can see from the collection of entities.

Let's take a look at the correct:

And that's what we're sending back:

is not very clear, is very to pass is a notice entity, came is an object, this is very simple, because I call the background method is not the mapping entity but the mapping table caused.

caused By:java.lang.ClassNotFoundException:com.tgb.itoo.authority.entity.User from[module " Deployment.itoo-authority-userrole-ear.ear.itoo-authority-userrole-core-0.0.1-snapshot.jar:main "from Service Module Loader]

Class cannot find that, this exception is the class did not load successfully, unable to find the ear, we regenerate the line.

11:31:19,173 error[org.apache.catalina.core.containerbase.[ Jboss.web]. [Default-host]. [/itoo-authority-start-web]. [Action]] (http-/0.0.0.0:8091-1) JBWEB000236:Servlet.service () for Servlet action Threwexception:java.net.ConnectException:Connection refused: Connect

The connection was rejected to see if it could be ping, or if the CAS did not start.

14:41:36,770 ERROR [org.jboss.as.ejb3.invocation] (http-/0.0.0.0:8091-1) JBAS014134: to Component Noticebeanimpl the method Public Abstractcom.tgb.itoo.authority.entity.Noticecom.tgb.itoo.authority.service.NoticeBean.findNoticeByNoticeId ( java.lang.string,java.lang.string) EJB call failed : javax.ejb.EJBException: Java.lang.NullPointerException

The EJB call failed with a null pointer exception, and the parameter in the method is null.

caused By:java.lang.ClassNotFoundException:com.tgb.itoo.authority.entity.Discution from[module "Org.apache.shiro: Main "from local module loader @768b970c (finder:local module finder @5a4041cc (roots:e:\java\jboss-eap-6.2\modules,e:\ Java\jboss-eap-6.2\modules\system\layers\base)]

This exception, is added Shiro problem, generally caused friebug collapse, restart the friebug can be.

12:11:38,827info [stdout] (serverservice Thread pool--Bayi) caused by: Com.mysql.jdbc.exceptions.jdbc4.CommunicationsException:Communications link Failure

Connection problem, deletebyids the first parameter of this method class<t> T, to note that this can not be casually written.

14:36:52,181 error[org.apache.catalina.core.containerbase.[ Jboss.web]. [Default-host]. [/itoo-authority-start-web]. [Action]] (http-/0.0.0.0:8091-1) JBWEB000236:Servlet.service () for Servlet action Threwexception:java.lang.IllegalArgumentException:Unknown return Value Type[java.lang.boolean]

The return value type is not clear, this should be solved well.

Summarize:

A project to do first, do more, while thinking, think about it, so, the principle slowly understand, learning is a long thing, experience more, naturally know where the problem.

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Summary of issues encountered in Java permissions