Java中ssh整合常見錯誤的示例分析

這篇文章將為大家詳細講解有關Java中ssh整合常見錯誤的示例分析，小編覺得挺實用的，因此分享給大家做個參考，希望大家閱讀完這篇文章后可以有所收獲。

1. org.springframework.transaction.CannotCreateTransactionException: Could not open JPA EntityManager for transaction; nested exception is java.lang.UnsupportedOperationException: Not supported by BasicDataSource

Spring不能為JAP創建事務。原因是bean.xml設定了數據源persistence.xml中要把數據庫連接去掉

<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&amp;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)

這個注解寫在get方法上不要寫在屬性聲明上。

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：實體類字段中的visible插入到數據庫中所對應的值為ASCII碼味49，超出范圍。

換個mysql的jar包解決問題。

4. web容器出現

嚴重: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory

此問題多樣化，查閱資料說是jar包commons-logging.jar問題 ,但解決的方式是重新導入項目...

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 與hibernate下的asm.jar 沖突， 刪除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：包沖突，刪掉struts1.3自帶的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對硬盤的session讀取失敗，徹底解決辦法一下：將work下面的文件清空，主要是*.ser文件，或者只是刪除掉session.ser即可以解決。

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標記錯了,標記在了String 等類型上
(2) 對id字段手工設定了值。

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：項目使用了<context:component-scan/>掃描機制, 而類BrandAction沒有標注為原型,
為類添加 @Scope("prototype")標注(與@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 與 persistence.xml中都配置了數據庫連接,注釋掉persistence.xml中的連接信息

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"/>，將其注釋掉

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