error java lang nullpointerexception unexpected error

JsonMappingException: (was java. lang. NullPointerException)An exception is reported when java objects are serialized using jackson: com.fasterxml.jackson.databind.JsonMappingException: (was java.lang.NullPointerException) (through reference chain: com.chanjet.gov.Student["age"]) at com.fasterxml.jackson.databind.Js

Java. lang. NullPointerException: No FileItemFactory has been set., fileitemfactory 1. Error description java.lang.NullPointerException: No FileItemFactory has been set.at org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:354)at org.apache.commons.fileupload.servlet.ServletFileUpload.parseR

Java. Lang. Error: unresolved compilation problem:Constants. centeryearsreportclasstime cannot be resolved At com. sencloud. DH. OA. Action. Report. centeryearsreportaction. statisticsrevenue (centeryearsreportaction. Java: 255)At com. sencloud. DH. OA. Action. Report. centeryearsreportaction. statisticscenter (center

Java. lang. error: Unresolved compilation problem: Constants. CENTERYEARSREPORTCLASSTIME cannot be resolved at com. sencloud. dh. oa. action. report. centerYearsReportAction. statisticsRevenue (CenterYearsReportAction. java: 255) at com. sencloud. dh. oa. action. report. centerYearsReportAction. statisticsCenter (Cente

Java. Lang. nullpointerexceptionAt oracle. JDBC. Driver. scrollableresultset. Close (scrollableresultset. Java: 149)At org. Apache. tomcat. DBCP. DBCP. delegatingresultset. Close (delegatingresultset. Java: 152)At com. Unify. Common. Page. exportalldata (page. Java: 234) ..

Environment: eclipse3.3.0 + myeclipse5.5.1ga (spring2.0 + struts1.1 + hibernate3.1) The error is: Java. Lang. nosuchmethoderrorCode:15:20:54, 093 error contextloader: 203-context initialization failedOrg. springframework. beans. factory. beancreationexception: Error creating

When I was working on a project and calling data in isubitemdao, the problem of hibernate java. Lang. nullpointerexception always occurred, and the page cannot be displayed. Then I checked the following online and saw the following message:Check the configuration file.For example, in Struts-config, whether the action name and path are consistent with those regist

must be set to the same, and-xmn is the-xmx value of 1/4.The-XMS-xmn setting of heap size should not exceed the physical memory size. Otherwise, the system prompts "error occurred during initialization of VM cocould not reserve enough space for object Heap ". ========================================================== ============================After one night of hard work, I finally completed a program for replacing the specified string with a file

Error querying database. Cause: java. lang. IllegalArgumentException: Mapped Statements collection does not contain value ..., Querying After compiling and running the web successfully, you do not need to connect to the database on the accessed page. If you do not call the object class through reflection, no error is r

Author: Xiaolou Original Website: Http://blog.vonno.com/33993/viewspace_1245 17:50:57/personal classification: Knowledge Summary Cause:An exception occurs when a Java program is used to query a large amount of data from the database:Java. Lang. outofmemoryerror: Java heap SpaceThis exception is thrown if 98% is used for GC and the available heap size is less tha

From: http://hi.baidu.com/dearfenix/blog/item/1b0ce80e64ca12ce7bcbe109.html It has always been known that JVM heap size can be set, and Java programs are always written/debugged using eclipse. Run the program by adding parameters on the command line or console. Symptom: In the eclipse configuration file eclipse. set-vmargs-xms500m-xmx1024m in ini. Java still appears when you run or debug some memory-consu

Addnode. sh failed, log file error PRKC-1025 java. lang. OutOfMemoryError: Java heap space,Environment: Linux 5.5 + RAC 11203 Problem description: The command to add a cluster member is as follows: $ GRID_HOME/oui/bin/addNode. sh-silent "CLUSTER_NEW_NODES = {X3850AR}" "CLUSTER_NEW_PRIVATE_NODE_NAMES = {X3850AR-priv}"

In the past few days, a part-time employee's information entry system has encountered an error where hibernate cannot query the specified condition data. Now we can find a solution: The error message is as follows:HTTP status 500- -------------------------------------------------------------------------------- Type exception report Message Description the server encountered an internal

Eclipse memory overflow error: Java. Lang. outofmemoryerror: Java heap space. 1. view memory: Workspace /. metadata /. plugins/org. eclipse. core. runtime /. settings/org. eclipse. UI. prefs, add show_memory_monitor = true to it, and restart eclipse to view the memory usage in the lower left corner. 2. Modify the me

As a flex development tool for Visual Studio plug-ins, Tofino of ensemble is indeed very attractive, and the total number of installation files including the compiling environment is only 122 MB, which is much higher than that of flex builder. Moreover, it is much easier for. Net programmers who are familiar with the vs development environment to use such plug-ins for flex development. Download the installation file from the official website, and select the installation package containing the de

During RCP Eclipse plug-in development, the following error is always reported when the management software interface is started: ! Entry org. Eclipse. UI. workbench 4 0 18:44:21. 306! Message warning: prevented recursive attempt to activate part Org. gluster. storage. management. console. views. clustersummaryview while still in the middle of activating part Org. gluster. storage. management. console. views. navigationview! Stack 0Java.

Here we use Http://blog.csdn.net/oscar999/article/details/7305489 Jdbctest. Java source file in 1. Use the compilation command in JDK to compile the. Class file. "C:\Program Files\Java\jdk1.6.0_24\bin\javac.exe" -cp ojdbc14.jar; JDBCTest.java 2. Run the Java command in jdk1.5. "C:\Program Files\Java\jdk1.5.0_14\bin\