Java编程ssh整合常见错误解析

1. org.springframework.transaction.cannotcreatetransactionexception: could not open jpa entitymanager for transaction; nested exception is java.lang.unsupportedoperationexception: not supported by basicdatasource

spring不能为jap创建事务。原因是bean.xml设定了数据源persistence.xml中要把数据库连接去掉

<property name="hibernate.connection.username" value="xxx"/>
<property name="hibernate.connection.password" value="xxx"/> 
<property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/xxx? useunicode=true&characterencoding=utf-8"/>

2. org.springframework.beans.factory.beancreationexception: error creating bean with name 'productservicebean': injection of persistence fields failed; nested exception is org.springframework.beans.factory.beancreationexception: error creating bean with name 'entitymanagerfactory' defined in class path resource [beans.xml]: invocation of init method failed; nested exception is javax.persistence.persistenceexception: org.hibernate.mappingexception: could not determine type for: java.util.set, for columns: [org.hibernate.mapping.column(childtypes)]

原因：@id @generatedvalue(strategy = generationtype.auto)

这个注解写在get方法上不要写在属性声明上。

3. javax.persistence.persistenceexception: org.hibernate.exception.dataexception: could not insert: [com.yufei.bean.product.producttype]
caused by: java.sql.sqlexception: data too long for column 'visible' at row 1

原因：实体类字段中的visible插入到数据库中所对应的值为ascii码味49，超出范围。

换个mysql的jar包解决问题。

4. web容器出现

严重: exception sending context initialized event to listener instance of class org.springframework.web.context.contextloaderlistener java.lang.noclassdeffounderror: org/apache/commons/logging/logfactory

此问题多样化，查阅资料说是jar包commons-logging.jar问题 ,但解决的方式是重新导入项目...

5. org.springframework.beans.factory.beancreationexception: error creating bean with name 'producttypeservice': injection of persistence fields failed; nested exception is org.springframework.beans.factory.beancreationexception: error creating bean with name 'entitymanagerfactory' defined in class path resource [beans.xml]: invocation of init method failed; nested exception is java.lang.nosuchmethoderror: org.objectweb.asm.classvisitor.visit(iiljava/lang/string;ljava/lang/string;[ljava/lang/string;ljava/lang/string;)v

原因： spring2.5下asm-2.2.3.jar 与hibernate下的asm.jar 冲突， 删除asm-2.2.3.jar 。

6. failed to load or instantiate taglibraryvalidator class: org.apache.taglibs.standard.tlv.jstlcoretlv
org.apache.jasper.compiler.defaulterrorhandler.jsperror(defaulterrorhandler.java:40)
org.apache.jasper.compiler.errordispatcher.dispatch(errordispatcher.java:407)
org.apache.jasper.compiler.errordispatcher.jsperror(errordispatcher.java:88)
org.apache.jasper.compiler.parser.processincludedirective(parser.java:340)

原因：lib中缺少standard.jar , jstl.jar

7. java.lang.nosuchfielderror: directory
at net.fckeditor.connector.impl.abstractlocalfilesystemconnector.getfolders(abstractlocalfilesystemconnector.java:140)
at net.fckeditor.connector.dispatcher.getfoldersandorfiles(dispatcher.java:204)
at net.fckeditor.connector.dispatcher.doget(dispatcher.java:156)
at net.fckeditor.connector.connectorservlet.doget(connectorservlet.java:89)

原因：包冲突，删掉struts1.3自带的commons-io-1.1.jar，commons-fileupload-1.1.1.jar，加入commons-io-1.3.2.jar，commons-fileupload-1.2.1.jar

8.ioexception while loading persisted sessions: java.io.eofexception
java.io.eofexception
at java.io.objectinputstream$peekinputstream.readfully(objectinputstream.java:2281)
at java.io.objectinputstream$blockdatainputstream.readshort(objectinputstream.java:2750)
at java.io.objectinputstream.readstreamheader(objectinputstream.java:780)
at java.io.objectinputstream.<init>(objectinputstream.java:280)

原因是tomcat对硬盘的session读取失败，彻底解决办法一下：将work下面的文件清空，主要是*.ser文件，或者只是删除掉session.ser即可以解决。

9.javax.persistence.persistenceexception: org.hibernate.persistentobjectexception: detached entity passed to persist: com.dalton.domain.user
org.hibernate.ejb.abstractentitymanagerimpl.throwpersistenceexception

原因：

(1) 是entity bean的 @id标记错了,标记在了string 等类型上
(2) 对id字段手工设定了值。

10 org.springframework.web.context.contextloader(line:215) - context initialization failed
org.springframework.beans.factory.beancreationexception: error creating bean with
name 'brand' defined in file [d:\tomcat6\webapps\autoet\web-inf\classes\com\autoet\
action\brand\brandaction.class]: instantiation of bean failed; nested exception is
org.springframework.beans.beaninstantiationexception: could not instantiate bean
class [com.autoet.action.brand.brandaction]: constructor threw exception; nested
exception is java.lang.nullpointerexception

原因：项目使用了<context:component-scan/>扫描机制, 而类brandaction没有标注为原型,
为类添加 @scope("prototype")标注(与@controller相同位置)

11 org.hibernate.tool.hbm2ddl.schemaupdate(line:222) - could not complete schema update
java.lang.unsupportedoperationexception: not supported by basicdatasource

原因 spring.xml 与 persistence.xml中都配置了数据库连接,注释掉persistence.xml中的连接信息

12 org.apache.struts2.dispatcher.dispatcher(line:27) - dispatcher initialization failed
unable to load configuration. - [unknown location]
cannot locate the chosen objectfactory implementation: spring - [unknown location]

原因 struts.xml中使用了<constant name="struts.objectfactory" value="spring"/>，将其注释掉

总结

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