PullCommand抛出了无法取回的东西。 JGit中的异常

Question

我在我的项目中使用JGit库。 这是我的JGit util类：

public class GitUtil {

    private static final RefSpec REF_SPEC = new RefSpec(Constants.GIT_REF_SPEC);
    private static final RefSpec REMOTE_REF_SPEC = new RefSpec(Constants.GIT_REMOTE_REF_SPEC);
    private static final CredentialsProvider credentialsProvider = new UsernamePasswordCredentialsProvider(Constants.GIT_REMOTE_USER_NAME, Constants.GIT_REMOTE_PASSWORD);
    private static Git git;
    @Autowired
    private HibernateUtilServiceImpl hibernateUtilServiceImpl;

    @PostConstruct
    public void initGitRepository() throws Exception {
        File file = new File(Constants.GIT_REPOSITORY_MAIN_FILE_PATH);
        FileRepositoryBuilder repositoryBuilder = new FileRepositoryBuilder();
        repositoryBuilder.addCeilingDirectory(file);
        repositoryBuilder.findGitDir(file);
        if (repositoryBuilder.getGitDir() == null) {
            git = Git.init().setDirectory(file.getParentFile()).call();
            StoredConfig config = git.getRepository().getConfig();
            config.setString("remote", "origin", "url", Constants.GIT_HSQLDB_REMOTE_REPOSTITORY_URL);
            RemoteConfig remoteConfig = new RemoteConfig(config, "remote");
            remoteConfig.addURI(new URIish(git.getRepository().getDirectory().toURI().toURL()));
            remoteConfig.update(config);
            config.save();
        } else {
            git = new Git(repositoryBuilder.build());
        }
        addUntrackedFiles(git.status().call().getUntracked(), git.getRepository());
    }

    public void commitAndPush() throws Exception {
        hibernateUtilServiceImpl.dumpDataBase();
        addUntrackedFiles(git.status().call().getUntracked(), git.getRepository());
        addChangedFiles(git.status().call().getModified(), git.getRepository());
        git.commit().setMessage("Update").call();
        git.push().setRemote("origin")
                .setCredentialsProvider(credentialsProvider)
                .setRefSpecs(REF_SPEC)
                .call();
    }

    public void pullAndMerge() throws GitAPIException, IOException {
        git.pull().call();
        hibernateUtilServiceImpl.backupDataBaseFromServer();
    }

    private void addUntrackedFiles(Collection<String> notTracked, Repository repository) throws Exception {
        if (notTracked == null || notTracked.size() == 0)
            return;
        AddCommand addCommand = git.add();
        for (String path : notTracked) {
            addCommand.addFilepattern(path);
        }
        addCommand.call();
    }

    private void addChangedFiles(Collection<String> changed, Repository repository) throws GitAPIException {
        if (changed == null || changed.size() == 0)
            return;
        AddCommand addCommand = git.add();
        for (String path : changed) {
            addCommand.addFilepattern(path);
        }
        addCommand.call();
    }
}

.git文件夹中的我的配置git配置文件：

[core]
    symlinks = false
    repositoryformatversion = 0
    filemode = false
    logallrefupdates = true
[remote "origin"]
    url = https://bitbucket.com/<my-profile>/<my-repository>.git
[remote "remote"]
    url = file:///D:/database/.git/
[gui]
    wmstate = zoomed
    geometry = 443x321+75+75 171 192

除pullAndMerge方法外，几乎所有方法都有效。 我得到了这个例外：

org.eclipse.jgit.api.errors.TransportException: Nothing to fetch.
    at org.eclipse.jgit.api.FetchCommand.call(FetchCommand.java:135)
    at org.eclipse.jgit.api.PullCommand.call(PullCommand.java:267)
    at com.uz.laboratory.statistical.util.GitUtil.pullAndMerge(GitUtil.java:61)
    at com.uz.laboratory.statistical.controller.settings.SettingsController.updateCurrentDatabaseButtonListener(SettingsController.java:44)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
    at sun.reflect.GeneratedMethodAccessor28.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
    at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1769)
    at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
    at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
    at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
    at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
    at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
    at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
    at javafx.event.Event.fireEvent(Event.java:198)
    at javafx.scene.Node.fireEvent(Node.java:8411)
    at javafx.scene.control.Button.fire(Button.java:185)
    at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182)
    at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:96)
    at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:89)
    at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
    at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
    at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
    at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
    at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
    at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
    at javafx.event.Event.fireEvent(Event.java:198)
    at javafx.scene.Scene$MouseHandler.process(Scene.java:3757)
    at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
    at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
    at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:380)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:294)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(GlassViewEventHandler.java:416)
    at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:415)
    at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
    at com.sun.glass.ui.View.notifyMouse(View.java:937)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
    at java.lang.Thread.run(Thread.java:745)
Caused by: org.eclipse.jgit.errors.TransportException: Nothing to fetch.
    at org.eclipse.jgit.transport.Transport.fetch(Transport.java:1155)
    at org.eclipse.jgit.api.FetchCommand.call(FetchCommand.java:128)
    ... 65 more

我无法弄清楚如何修复它。 你能否提出一些建议和一些代码示例来解决这个问题？ 也许是jgit正确拉动的示例代码。 感谢。

更新

感谢Stanidlav和Rudiger Herrmann的答案......但是当我加上这句话时：

public static final String GIT_REMOTE_REF_SPEC = "+refs/heads/*:refs/remotes/origin/*";
        ...
private static final RefSpec REMOTE_REF_SPEC = new RefSpec(Constants.GIT_REMOTE_REF_SPEC);
    ...
//a have added this to my initGitRepository() method.
    RemoteConfig originConfig = new RemoteConfig(config, "origin");
                        originConfig.addFetchRefSpec(REMOTE_REF_SPEC);
                        originConfig.update(config);
                        config.save();

我现在的过去问题已修复，但在此更改后我遇到了新问题：

org.eclipse.jgit.api.errors.RefNotAdvertisedException: Remote origin did not advertise Ref for branch master. This Ref may not exist in the remote or may be hidden by permission settings.
    at org.eclipse.jgit.api.PullCommand.call(PullCommand.java:294)
    at com.uz.laboratory.statistical.util.GitUtil.pullAndMerge(GitUtil.java:64)
    at com.uz.laboratory.statistical.controller.settings.SettingsController.updateCurrentDatabaseButtonListener(SettingsController.java:44)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
    at sun.reflect.GeneratedMethodAccessor28.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
    at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1769)
    at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
    at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
    at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
    at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
    at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
    at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
    at javafx.event.Event.fireEvent(Event.java:198)
    at javafx.scene.Node.fireEvent(Node.java:8411)
    at javafx.scene.control.Button.fire(Button.java:185)
    at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182)
    at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:96)
    at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:89)
    at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
    at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
    at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
    at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
    at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
    at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
    at javafx.event.Event.fireEvent(Event.java:198)
    at javafx.scene.Scene$MouseHandler.process(Scene.java:3757)
    at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
    at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
    at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:380)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:294)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(GlassViewEventHandler.java:416)
    at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:415)
    at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
    at com.sun.glass.ui.View.notifyMouse(View.java:937)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
    at java.lang.Thread.run(Thread.java:745)

Answer 1

看来，您尚未正确配置[remote "remote"]部分。你必须在那里添加这个属性

fetch = +refs/heads/*:refs/remotes/origin/*

它使Git获取所有refs/heads/并将其作为refs/remotes/origin/存储在本地。 Here可以阅读更多信息。

Answer 2

如果您尝试获取远程端不存在的引用，则会发生此异常。

例如，给定像refs/heads/foo:refs/remotes/origin/foo之类的refspec，并且远程端没有foo分支，就会出现此异常。

我认为要求不存在的ref不是错误，JGit在这种情况下不应该引发异常。相反，应返回适当的FetchResult，以便应用程序代码可以检测到这种情况并采取相应的行动。

但是，对于当前状态，您可以解决此问题，因为您捕获异常并尝试从异常消息中查明此情况。