error java lang nullpointerexception unexpected error

Java. SQL. SQLException: ORA-00604: recursive SQL Level 1 error, recursive SQL Level 1 error The following error is reported in the background: Caused by: java. SQL. SQLException: ORA-00604: recursive SQL Level 1 error ORA-01000:

1: When dataoutputstream java. Lang. nullpointerexception uses dataoutputstream to read and write data, the nullpointerexception error occurs because the dataoutputstream is not initialized. Two pairs of files use bufferedreader and bufferedwrite at the same time. If yo

[Java Web Learning] war exploded: Error during artifact deployment, explodedartifact Error: Artifact FirstWeb: war exploded: Error during artifact deployment. See server log for details. SEVERE: Exception sending context initialized event to listener instance of class org. springframework. web. context. ContextLoaderLi

Each time eclipse opens the. java file, the error message is as follows:An internal error occurred during: "Java EE Component Mapping Update". Java.lang.NullPointerException　　Workaround:1 Locate the workspace for the project directory, delete the . Settings folder.2 Eclipse Deletes the item (the local project file is n

Error:Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.5.1:compile (Default-compile) on project Testtxannotation:fatal error Compiling:tools.jar not Found:c:\program files\java\jre1.8.0_31\. \lib\tools.jarThis kind of mistake is accidental, the construction may appear several times, also may appear frequently.Workaround:Replace the JRE with the JDK's directory, previously: C:\Program

Using JDBC programming runtime error and its solution Daquan -- reprinted http://www.th7.cn/Program/java/201409/274583.shtml,www.th7.cn201409Errors During JDBC programming and Solutions Errors During JDBC programming and Solutions Source code: 1. java. lang. ClassNotFoundException: com. microsoft. jdbc. sqlserver. SQLS

Label:Today, when I was doing a project exercise, after integrating SSH, I found that the console had an error with Oracle: Error while registering Oracle JDBC diagnosability MBean.Javax.management.MalformedObjectNameException:Invalid character "in value part of the property at Javax.management.Object Name.construct (objectname.java:602) at Javax.management.ObjectName. (objectname.java:1394) at Oracle.jdbc.

Just beginning to learn Java, configuring the completion environment variable, when running the test instance, always " error: Cannot find or Load main class " error.Look for a long time to say is Classpath configuration error, but how to see there is no wrong. See a blog post finally solved. Blog Source http://blog.chinaunix.net/uid-22002627-id-3455122.htmlis to

detailed tips are as follows: An internal error occurred during: "Initializing Java tooling".Illegal exception table range in class file Org/eclipse/jdt/internal/compiler/ast/abstractmethoddeclaration WORKAROUND: With "reset Window Layout", the majority of cases can be resolved:Click on the menu navigation bar of Windows > Perspective > Reset Perspective(Online mainstream program is to delete a configuratio

. Check-type exceptions require the use of try, catch and finally keywords to be processed at compile time, or the compiler will error. You do not need to do this for non-checked exceptions. All exceptions in Java that inherit from the Java.lang.Exception class are check-type exceptions, and all exceptions that inherit from RuntimeException are referred to as non-checked exceptions. You can also check out t

org.springframework.context.support.classpathxmlapplicationcontext.second, the solution. Upgrade the versions of the two jar packages of Aspectjweaver.jar and Aspectjrt.jar to run successfully with the two versions of the jar packages aspectjweaver-1.7.0 and aspectjrt-1.7.2. third, summary. in our development we have to pay attention to whether the JDK matches the versions of the jar packages sometimes, although the JDK is upgraded but the jar we want to use is not ad

The following error is always reported when the project was down from the svn server yesterday afternoon to build in eclipse. Error generating final archive: Java. Io. filenotfoundexception: D: \ work \ XXXX \ bin \ Classes \ resources. AP _ does not existxxxx unknown Android Packaging Problem The final conclusion is that aapt crash (aapt is used to package var

SSH ProjectIn the case of network complexity (unknown law), when Tomcat starts, the following error is reported:[ERROR] 2014-08-12 14:52:58,484 [org.apache.struts2.dispatcher.dispatcher:27]-Dispatcher initialization failedUnable to load configuration. -Class:java.net.AbstractPlainSocketImplFile:AbstractPlainSocketImpl.javaMethod:connectLine:178-java/net/abstractp

SolutionsFirst, make sure your password is not right. If it's true:All Programs, Microsoft SQL Server 2005-config tool->sql Server configuration ManagerSelect: SQL Server 2005 Network configuration, then select: MSSQLSERVER protocol, then right-click TCP/IP, then right click TCP/IP, select Properties, select IP address, "enabled" under IP1, select "Yes" ... And then restart the service .......... over!Java Connection SQL server2008 R2