java lang classcastexception

Tomcat outofmemoryerror (permgen space) Solution Recently I have been familiar with a project that has been developed for several years. I need to port the database from MySQL to Oracle. First, I need to point the JDBC connection to MySQL and package it into tomcat to run it. There is no problem, however, when the JDBC connection is directed to Oracle, Tomcat continuously throws Java. lang. outofmemoryerro

Bug information: 10-16 17:27:20. 250: D/androidruntime (14662): Shutting Down VM10-16 17:27:20. 250: W/dalvikvm (14662): threadid = 1: thread exiting with uncaught exception (group = 0x40a5e228)10-16 17:27:20. 250: E/androidruntime (14662): Fatal exception: Main10-16 17:27:20. 250: E/androidruntime (14662): Java. Lang. illegalargumentexception: parameter must be a descendant of this view10-16 17:27:20. 250:

An error is reported when you use m2eclipse to import an existing Maven project. Java. Lang. nullpointerexceptionAt org. Apache. Maven. plugin. defaultindescriptorcache $ cachekey. At org. Apache. Maven. plugin. defaultindescriptorcache. createkey (defaultplugindescriptorcache. Java: 62)At org. Apache. Maven. plugin. Internal. defaultmavenpluginmanager. getplugi

Both processbuilder.start()and runtime.exe c can create a local (native) Process and return a Java Process instance representing the Process.The Java. lang. process class can be used to control the process and obtain some information about the process. (1) Call the system command to create the process and obtain the command output. Use runtime.exe c (String cmd )

An error occurred while exporting jxl Excel: Java. Lang. arrayindexoutofboundsexception: 31 Java. Lang. arrayindexoutofboundsexception: 31At jxl. Biff. indexmapping. getnewindex (indexmapping. Java: 68)At jxl. Biff. formattingrecords. rationalize (formattingrecords.

Commons LangThe standard Java libraries fail to provide enough methods for manipulation of its core classes. Apache Commons Lang provides these extra methods.Lang provides a host of helper utilities for the Java.lang API, notably String manipulation methods, basic numerical Metho DS, Object Reflection, concurrency, creation and serialization and System properties. Additionally it contains basic enhancements

Package java. Lang. Ref; Import java. Security. privilegedaction;Import java. Security. accesscontroller; // Comment by liqiang Final class finalizer extends finalreference {// class used in the package /** A local method is used to call the Finalize method of any object, because the Finalize method of the object* It i

Miscellaneous (3)-The type java. lang. Object cannot be resolved It is indirectly referenced..., cannotberesolved The type java. lang. Object cannot be resolved. It is indirectly referenced from required. class files This problem occurs when you reference JDK projects of different versions in Eclipse. This is caused

empty string, it is a null object .), The println method of the out object cannot directly operate on the null object. Therefore, the JSP page where code segment 1 is located will throw a "java. lang. NullPointerException" exception.Even if the Object may be empty, some methods of java. lang. Object or Objec

Java. lang. SecurityException: Filter of class org. apache. catalina. ssi. SSIFilter is privileged and cannot be loaded by this web application, privileged Error:1 java. lang. securityException: Filter of class org. apache. catalina. ssi. SSIFilter is privileged and cannot be loaded by this web application 2 at org. ap

I. Problems Found Recently, I was notified by my maintenance colleagues that a software written in Java could not run normally. the following exceptions were found in logs: Java. Lang. illegalstateexception: current state = flushed, new state = coding_end Info | JVM 1 | 2010/11/26 00:01:25 | At java. NiO. charset

Severe: exception starting filter struts2 Java. Lang. nullpointerexception At com. opensymphony. xwork2.util. filemanager $ filerevision. needsreloading (filemanager. Java: 209) At com. opensymphony. xwork2.util. filemanager. fileneedsreloading (filemanager. Java: 60) At com. opensymphony. xwork2.config. providers. xml

, such as JBoss and WebLogic, share the same principle. I. java. lang. outofmemoryerror: The full name of permgen space is permanent generation space, which refers to the permanent storage area of the memory. This memory is mainly used by JVM to store class and meta information, when a class is loaded, it will be placed in the permgen space. It is different from the heap region where the class instance is s

as the following information: Java. Lang. illegalargumentexception: ID to load is required for loadingOrg. hibernate. event. loadevent. Org. hibernate. event. loadevent. Org. hibernate. impl. sessionimpl. Get (sessionimpl. Java: 812)Org. hibernate. impl. sessionimpl. Get (sessionimpl. Java: 808)Com. zyeeda. projs. cm

Solving Tomcat outofmemoryerror: heap space and permgen spacetomcat March 12th, 2009 It's quite common to run inMemory problemsWhen running some big Java EE application on a Tomcat server.Some of the most commmon errors are like the following ones. This is about a fullHeap Space: Severe: servlet. Service () for servlet JSP threw exceptionjava. Lang. outofmemoryerror:

Java. lang. ThreadLocalIn-depth study of java. lang. ThreadLocal Class 1. What is ThreadLocal? In fact, ThreadLocal is not a local implementation version of a Thread, it is not a Thread, but threadlocalvariable (Thread local variable ). It may be more appropriate to name it ThreadLocalVar. ThreadLocal provides a copy o

12-19 12:12:42. 701: E/androidruntime (626): Java. lang. runtimeexception: unable to start activity componentinfo {COM. CLM. activity/COM. CLM. activity. registactivity}: Java. lang. nullpointerexception 12-19 12:12:42. 701: E/androidruntime (626 ):At com. CLM. activity. registactivity. oncreate (registactivity.

Package java. Lang; Import java. Io .*;Import java. util. properties;Import java. util. propertypermission;Import java. util. stringtokenizer;Import java. Security. accesscontroller;Imp

Java. Lang. noclassdeffounderror: COM. jayway. Android. robotium. Solo. Solo At com. skymobi. Android. qc. Test. robottest. Setup (robottest. Java: 46) At Android. Test. androidtestrunner. runtest (androidtestrunner. Java: 169) At Android. Test. androidtestrunner. runtest (androidtestrunner.

Remember to use the bytecode modification method to solve java. lang. NoSuchMethodError, bytecode Rabbit International sdk ane The recharge interface will crash when you select rabbit currency recharge, Observe logcat, NoSuchMethodError: com. tutu. common. a. B. getContext because there is no way to find it 04-19 10:10:54.224: E/AndroidRuntime(20315): FATAL EXCEPTION: main04-19 10:10:54.224: E/AndroidRunti