问题描述
我在创建休眠映射文件（hbm.xml）时遇到了java.lang.NullPointerException。我正在使用Eclipse IDE 2020-06和JBoss Tools 4.16.0 final。
pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.wipro</groupId>
<artifactId>Introduction_to_Hibernate</artifactId>
<version>0.0.1-SNAPSHOT</version>
<dependencies>
<!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-core -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>5.4.10.Final</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.oracle.database.jdbc/ojdbc8 -->
<dependency>
<groupId>com.oracle.database.jdbc</groupId>
<artifactId>ojdbc8</artifactId>
<version>19.7.0.0</version>
</dependency>
</dependencies>
</project>
hibernate.cfg.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory name="sessionfactory1">
<property name="hibernate.connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
<property name="hibernate.connection.password">tiger</property>
<property name="hibernate.connection.url">jdbc:oracle:thin:@localhost:1521:orcl</property>
<property name="hibernate.connection.username">scott</property>
<property name="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</property>
<mapping class="com.wipro.bean.Emp"/>
</session-factory>
</hibernate-configuration>
Emp.java
package com.wipro.bean;
import java.util.Date;
public class Emp {
private int empno;
private String ename;
private String job;
private int mgr;
private Date hiredate;
private float sal;
private float comm;
private int deptno;
public Emp() {
super();
// Todo Auto-generated constructor stub
}
public Emp(int empno,String ename,String job,int mgr,Date hiredate,float sal,float comm,int deptno) {
super();
this.empno = empno;
this.ename = ename;
this.job = job;
this.mgr = mgr;
this.hiredate = hiredate;
this.sal = sal;
this.comm = comm;
this.deptno = deptno;
}
public int getEmpno() {
return empno;
}
public void setEmpno(int empno) {
this.empno = empno;
}
public String getEname() {
return ename;
}
public void setEname(String ename) {
this.ename = ename;
}
public String getJob() {
return job;
}
public void setJob(String job) {
this.job = job;
}
public int getMgr() {
return mgr;
}
public void setMgr(int mgr) {
this.mgr = mgr;
}
public Date getHiredate() {
return hiredate;
}
public void setHiredate(Date hiredate) {
this.hiredate = hiredate;
}
public float getSal() {
return sal;
}
public void setSal(float sal) {
this.sal = sal;
}
public float getComm() {
return comm;
}
public void setComm(float comm) {
this.comm = comm;
}
public int getDeptno() {
return deptno;
}
public void setDeptno(int deptno) {
this.deptno = deptno;
}
@Override
public String toString() {
return "Emp [empno=" + empno + ",ename=" + ename + ",job=" + job + ",mgr=" + mgr + ",hiredate=" + hiredate
+ ",sal=" + sal + ",comm=" + comm + ",deptno=" + deptno + "]";
}
}
错误日志
从插件调用代码“ org.eclipse.jface”时出现问题。
eclipse.buildId=4.16.0.I20200604-0540
java.version=11
java.vendor=Oracle Corporation
BootLoader constants: OS=win32,ARCH=x86_64,WS=win32,NL=en_US
Framework arguments: -product org.eclipse.epp.package.jee.product
Command-line arguments: -os win32 -ws win32 -arch x86_64 -product org.eclipse.epp.package.jee.product
org.eclipse.jface
Error
Mon Aug 31 00:53:20 IST 2020
Problems occurred when invoking code from plug-in: "org.eclipse.jface".
java.lang.NullPointerException
at org.hibernate.eclipse.jdt.ui.wizards.NewHibernateMappingFileWizard.getService(NewHibernateMappingFileWizard.java:300)
at org.hibernate.eclipse.jdt.ui.wizards.NewHibernateMappingFileWizard.access$1(NewHibernateMappingFileWizard.java:294)
at org.hibernate.eclipse.jdt.ui.wizards.NewHibernateMappingFileWizard$HibernateMappingExporterWrapper.<init>(NewHibernateMappingFileWizard.java:285)
at org.hibernate.eclipse.jdt.ui.wizards.NewHibernateMappingFileWizard.getPlaces2Gen(NewHibernateMappingFileWizard.java:322)
at org.hibernate.eclipse.jdt.ui.wizards.NewHibernateMappingFileWizard.handlePageChanging(NewHibernateMappingFileWizard.java:171)
at org.eclipse.jface.wizard.WizardDialog$6.run(WizardDialog.java:1565)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:174)
at org.eclipse.jface.wizard.WizardDialog.firePageChanging(WizardDialog.java:1562)
at org.eclipse.jface.wizard.WizardDialog.doPageChanging(WizardDialog.java:930)
at org.eclipse.jface.wizard.WizardDialog.showPage(WizardDialog.java:1214)
at org.eclipse.jface.wizard.WizardDialog.nextpressed(WizardDialog.java:917)
at org.eclipse.jface.wizard.WizardDialog.buttonpressed(WizardDialog.java:468)
at org.eclipse.jface.dialogs.Dialog.lambda$0(Dialog.java:619)
at org.eclipse.swt.events.SelectionListener$1.widgetSelected(SelectionListener.java:84)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:252)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:89)
at org.eclipse.swt.widgets.display.sendEvent(display.java:4213)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1037)
at org.eclipse.swt.widgets.display.runDeferredEvents(display.java:4030)
at org.eclipse.swt.widgets.display.readAnddispatch(display.java:3630)
at org.eclipse.jface.window.Window.runEventLoop(Window.java:823)
at org.eclipse.jface.window.Window.open(Window.java:799)
at org.eclipse.ui.internal.handlers.WizardHandler$New.executeHandler(WizardHandler.java:260)
at org.eclipse.ui.internal.handlers.WizardHandler.execute(WizardHandler.java:280)
at org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:283)
at org.eclipse.ui.internal.handlers.E4HandlerProxy.execute(E4HandlerProxy.java:97)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:58)
at org.eclipse.e4.core.internal.di.InjectorImpl.invokeUsingClass(InjectorImpl.java:319)
at org.eclipse.e4.core.internal.di.InjectorImpl.invoke(InjectorImpl.java:253)
at org.eclipse.e4.core.contexts.ContextInjectionFactory.invoke(ContextInjectionFactory.java:173)
at org.eclipse.e4.core.commands.internal.HandlerServiceHandler.execute(HandlerServiceHandler.java:156)
at org.eclipse.core.commands.Command.executeWithChecks(Command.java:488)
at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:487)
at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.executeHandler(HandlerServiceImpl.java:213)
at org.eclipse.ui.internal.handlers.LegacyHandlerService.executeCommand(LegacyHandlerService.java:389)
at org.eclipse.ui.internal.actions.CommandAction.runWithEvent(CommandAction.java:142)
at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:579)
at org.eclipse.jface.action.ActionContributionItem.lambda$4(ActionContributionItem.java:413)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:89)
at org.eclipse.swt.widgets.display.sendEvent(display.java:4213)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1037)
at org.eclipse.swt.widgets.display.runDeferredEvents(display.java:4030)
at org.eclipse.swt.widgets.display.readAnddispatch(display.java:3630)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1158)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1047)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:155)
at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:658)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:557)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:154)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:150)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:203)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:137)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:107)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:401)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:657)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:594)
at org.eclipse.equinox.launcher.Main.run(Main.java:1447)
未处理的事件循环异常
eclipse.buildId=4.16.0.I20200604-0540
java.version=11
java.vendor=Oracle Corporation
BootLoader constants: OS=win32,NL=en_US
Framework arguments: -product org.eclipse.epp.package.jee.product
Command-line arguments: -os win32 -ws win32 -arch x86_64 -product org.eclipse.epp.package.jee.product
org.eclipse.ui
Error
Mon Aug 31 01:00:37 IST 2020
Unhandled event loop exception
java.lang.NullPointerException
at com.genuitec.eclipse.codetogether.ui.actions.EclipSEOfferOnSelection.scrollingChanged(EclipSEOfferOnSelection.java:419)
at com.genuitec.eclipse.codetogether.ui.actions.EclipSEOfferOnSelection$ScrollingListener.widgetSelected(EclipSEOfferOnSelection.java:69)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:252)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:89)
at org.eclipse.swt.widgets.display.sendEvent(display.java:4213)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1037)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1061)
at org.eclipse.swt.widgets.Widget.sendSelectionEvent(Widget.java:1078)
at org.eclipse.swt.widgets.ScrollBar.wmScrollChild(ScrollBar.java:1001)
at org.eclipse.swt.widgets.Scrollable.wmScroll(Scrollable.java:475)
at org.eclipse.swt.widgets.Scrollable.WM_VSCROLL(Scrollable.java:366)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:4829)
at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:340)
at org.eclipse.swt.widgets.display.windowProc(display.java:4923)
at org.eclipse.swt.internal.win32.OS.SendMessage(Native Method)
at org.eclipse.swt.widgets.Scrollable.wmScrollWheel(Scrollable.java:396)
at org.eclipse.swt.widgets.Scrollable.WM_MOUSEWHEEL(Scrollable.java:349)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:4788)
at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:340)
at org.eclipse.swt.widgets.display.windowProc(display.java:4923)
at org.eclipse.swt.internal.win32.OS.dispatchMessage(Native Method)
at org.eclipse.swt.widgets.display.readAnddispatch(display.java:3628)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1158)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1047)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:155)
at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:658)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:557)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:154)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:150)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:203)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:137)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:107)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:401)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:657)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:594)
at org.eclipse.equinox.launcher.Main.run(Main.java:1447)
屏幕截图
Screenshot of the NullPointerException occured
解决方法
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