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當我嘗試從我的項目實體生成數據庫表時，下面的異常被拋出。從實體生成表導致NoInitialContextException
如果我理解正確，異常建議到指定java.naming.factory.initial：
所以我通過JBoss的文檔的幾個部分去了，搞不清我一直在尋找，確實有jndi.properties -file實驗，並最終實現我絕對無能爲力。
順便說一句：從表中生成實體（所以相反）工作沒有問題。
[EL Info]: EclipseLink, version: Eclipse Persistence Services - 2.3.2.v20111125-r10461
[EL Severe]: Local Exception Stack:
Exception [EclipseLink-7060] (Eclipse Persistence Services - 2.3.2.v20111125-r10461): org.eclipse.persistence.exceptions.ValidationException
Exception Description: Cannot acquire data source [java:jboss/datasources/MySQLDS].
Internal Exception: javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial
at org.eclipse.persistence.exceptions.ValidationException.cannotAcquireDataSource(ValidationException.java:497)
at org.eclipse.persistence.sessions.JNDIConnector.connect(JNDIConnector.java:109)
at org.eclipse.persistence.sessions.DatasourceLogin.connectToDatasource(DatasourceLogin.java:162)
at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:584)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:206)
at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:488)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getDatabaseSession(EntityManagerFactoryDelegate.java:188)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.createEntityManagerImpl(EntityManagerFactoryDelegate.java:277)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:294)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:272)
at org.eclipse.jpt.jpa.eclipselink.core.ddlgen.Main.perform(Main.java:85)
at org.eclipse.jpt.jpa.eclipselink.core.ddlgen.Main.execute(Main.java:76)
at org.eclipse.jpt.jpa.eclipselink.core.ddlgen.Main.main(Main.java:63)
Caused by: javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial
at javax.naming.spi.NamingManager.getInitialContext(Unknown Source)
at javax.naming.InitialContext.getDefaultInitCtx(Unknown Source)
at javax.naming.InitialContext.getURLOrDefaultInitCtx(Unknown Source)
at javax.naming.InitialContext.lookup(Unknown Source)
at org.eclipse.persistence.sessions.JNDIConnector.connect(JNDIConnector.java:103)
... 11 more
Exception in thread "main" javax.persistence.PersistenceException: Exception [EclipseLink-7060] (Eclipse Persistence Services - 2.3.2.v20111125-r10461): org.eclipse.persistence.exceptions.ValidationException
Exception Description: Cannot acquire data source [java:jboss/datasources/MySQLDS].
Internal Exception: javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial
at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:517)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getDatabaseSession(EntityManagerFactoryDelegate.java:188)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.createEntityManagerImpl(EntityManagerFactoryDelegate.java:277)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:294)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:272)
at org.eclipse.jpt.jpa.eclipselink.core.ddlgen.Main.perform(Main.java:85)
at org.eclipse.jpt.jpa.eclipselink.core.ddlgen.Main.execute(Main.java:76)
at org.eclipse.jpt.jpa.eclipselink.core.ddlgen.Main.main(Main.java:63)
Caused by: Exception [EclipseLink-7060] (Eclipse Persistence Services - 2.3.2.v20111125-r10461): org.eclipse.persistence.exceptions.ValidationException
Exception Description: Cannot acquire data source [java:jboss/datasources/MySQLDS].
Internal Exception: javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial
at org.eclipse.persistence.exceptions.ValidationException.cannotAcquireDataSource(ValidationException.java:497)
at org.eclipse.persistence.sessions.JNDIConnector.connect(JNDIConnector.java:109)
at org.eclipse.persistence.sessions.DatasourceLogin.connectToDatasource(DatasourceLogin.java:162)
at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:584)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:206)
at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:488)
... 7 more
Caused by: javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial
at javax.naming.spi.NamingManager.getInitialContext(Unknown Source)
at javax.naming.InitialContext.getDefaultInitCtx(Unknown Source)
at javax.naming.InitialContext.getURLOrDefaultInitCtx(Unknown Source)
at javax.naming.InitialContext.lookup(Unknown Source)
at org.eclipse.persistence.sessions.JNDIConnector.connect(JNDIConnector.java:103)
... 11 more
我的persistence.xml
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0"
xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
<persistence-unit name="DynamicWebProject" transaction-type="JTA">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<jta-data-source>java:jboss/datasources/MySQLDS</jta-data-source>
<class>hoho.model.generated.AvailabilityDeliveryMethod</class>
<class>hoho.model.generated.AvailabilityItem</class>
<class>hoho.model.generated.AvailabilityRestaurant</class>
<class>hoho.model.generated.Category</class>
<class>hoho.model.generated.ContactData</class>
<class>hoho.model.generated.Deliverer</class>
<class>hoho.model.generated.DeliveryMethod</class>
<class>hoho.model.generated.DeliveryMethodHasPrice</class>
<class>hoho.model.generated.Item</class>
<class>hoho.model.generated.Label</class>
<class>hoho.model.generated.OrderHasItem</class>
<class>hoho.model.generated.OrderLimitation</class>
<class>hoho.model.generated.PaymentMethod</class>
<class>hoho.model.generated.Person</class>
<class>hoho.model.generated.PersonPreference</class>
<class>hoho.model.generated.Price</class>
<class>hoho.model.generated.PurchaseOrder</class>
<class>hoho.model.generated.Restaurant</class>
<class>hoho.model.generated.Tag</class>
<class>hoho.model.generated.Image</class>
<class>hoho.model.generated.MimeType</class>
<class>hoho.model.generated.TaxRate</class>
<properties>
<!-- <property name="eclipselink.ddl-generation" value="drop-and-create-tables"/> -->
<property name="javax.persistence.jtaDataSource" value="java:jboss/datasources/MySQLDS" />
</properties>
</persistence-unit>
</persistence>
錯誤指出它無法獲取數據源「java：jboss/datasources/MySQLDS」。你是否在服務器上運行這個服務器，並且你是否正確配置了數據源？在生成實體時，您正在使用eclipse及其與數據庫的連接。從實體生成表格時，它看起來像使用JPA和在persistence.xml中配置的數據庫連接 - 因此需要先設置這些連接。 – Chris
@Chris謝謝你的回答。 1.正在工作的'從表中生成實體「和非工作的'從實體生成表」都來自於右鍵單擊項目時獲得的上下文菜單的「JPA-Tools」子菜單。 2.我不確定：我認爲我沒有在服務器上運行它。當我嘗試使用停止的服務器進行生成時，它將保持停止狀態。它啓動時沒有區別。 – Lester
@Chris我將我的persistence.xml添加到問題中。 – Lester