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Java之ssh整合常见过错的处理

时间:2017-10-19 编辑:admin

这篇文章首要介绍了Java编程ssh整合常见过错解析,如果有什么不足之处,欢迎留言弥补。

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创立业务。原因是bean.xml设定了数据源persistence.xml中要把数据库衔接去掉


<property name="hibernate.connection.username" value="***"/>
<property name="hibernate.connection.password" value="***"/> 
<property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/***? 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办法上不要写在特点声明上。

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刺进到数据库中所对应的值为ASCII码味49,超出范围。

换个mysql的jar包处理问题。

4. web容器呈现

严峻: 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,查阅材料说是jar包commons-logging.jar问题 ,但处理的方法是从头导入项目...

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 抵触, 删去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中短少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:包抵触,删掉struts1.3自带的commons-io-1.1.jar,commons-fileupload-1.1.1.jar,参加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读取失利,完全处理办法一下:将work下面的文件清空,首要是*.ser文件,或许仅仅删去掉session.ser即可以处理。

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符号错了,符号在了String 等类型上
(2) 对id字段手艺设定了值。

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没有标示为原型,
为类增加 @Scope("prototype")标示(与@Controller相同方位)

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中都装备了数据库衔接,注释掉persistence.xml中的衔接信息

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

以上就是Java之ssh整合常见过错的处理的具体内容,更多请重视其它相关文章!


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