Question

我正在尝试使用J2ME编写一个使用javax.microedition.rms.RecordStore来存储持久数据的应用程序。我正在使用Gentoo上的NetBeans 6.0和J2ME 2.2开发这个项目。当我尝试运行该项目时，我收到一个错误，因为显然无法创建记录存储。这是一个输出样本，包括堆栈跟踪：

jar:
pre-run:
cldc-run:
Copying 1 file to /home/dzaslavs/ellipsix/programming/cataschedule/dist/nbrun1623864904410254936
Copying 1 file to /home/dzaslavs/ellipsix/programming/cataschedule/dist/nbrun1623864904410254936
Jad URL for OTA execution: http://localhost:8082/servlet/org.netbeans.modules.mobility.project.jam.JAMServlet/home/dzaslavs/ellipsix/programming/cataschedule/dist//CATASchedule.jad
Starting emulator in execution mode
Running with storage root rms
javax.microedition.rms.RecordStoreException: error opening record store file
        at javax.microedition.rms.RecordStore.(RecordStore.java:2150)
        at javax.microedition.rms.RecordStore.openRecordStore(RecordStore.java:208)
        at net.ellipsix.cata.StopRecordStore.(StopRecordStore.java:48)
        at net.ellipsix.cata.CATAMIDlet.getStopList(CATAMIDlet.java:169)
        at net.ellipsix.cata.CATAMIDlet.startMIDlet(CATAMIDlet.java:64)
        at net.ellipsix.cata.CATAMIDlet.startApp(CATAMIDlet.java:449)
        at javax.microedition.midlet.MIDletProxy.startApp(MIDletProxy.java:44)
        at com.sun.midp.midlet.Scheduler.schedule(Scheduler.java:372)
        at com.sun.midp.main.Main.runLocalClass(Main.java:461)
        at com.sun.midp.main.Main.main(Main.java:126)

我找到了一个链接，指向认为是RecordStore的来源，其中引发了异常：http://jcs.mobile-utopia.com/jcs/78052_RecordStore.java。相关线靠近底部，基本上是这样的：

try {
    ...
}
catch (java.io.IOException ioe) {
    ...
    throw new RecordStoreException("error opening record store " + 
                                       "file");
}

这表明当NetBeans尝试创建记录存储文件时会触发IOException。但为什么会这样呢？遗憾的是，输出完全没有记录存储创建失败的原因。有谁知道可能出现的问题，或者有关NetBeans如何在内部处理RecordStore的事情？

这是我的代码中的构造函数，如果它是相关的，则触发错误：

public StopRecordStore() throws RecordStoreException {
    this.store = RecordStore.openRecordStore("freqstops", true);
    if (store.getNumRecords() == 0) {
        try {
            byte[] collegeAllen = new StopRecord((short)1, "College & Allen").toBytes();
            store.addRecord(collegeAllen, 0, collegeAllen.length);
        }
        catch(IOException ioe) {
            ioe.printStackTrace();
        } // do nothing
    }
}

编辑：... 10小时后没有答案？真的？

Answer 1

我跑了

strace netbeans-6.0

并观察了应用程序出错时出现在输出中的文件名。

[pid 10593] stat64("/opt/sun-j2me-bin-2.2/bin/./../appdb/rms/run_by_class_storage_freqstops.db", 0xbfa475c0) = -1 ENOENT (No such file or directory)
[pid 10593] open("/opt/sun-j2me-bin-2.2/bin/./../appdb/rms", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY|0x80000) = -1 ENOENT (No such file or directory)
[pid 10593] stat64("/opt/sun-j2me-bin-2.2/bin/./../appdb/rms", 0xbfa475d0) = -1 ENOENT (No such file or directory)
[pid 10593] mkdir("/opt/sun-j2me-bin-2.2/bin/./../appdb/rms", 0777) = -1 EACCES (Permission denied)

手动创建目录/opt/sun-j2me-bin-2.2/appdb/rms和chmod将其解析为0777解决了这个问题。

在NetBeans 6.0中创建javax.microedition.rms.RecordStore时出错

1 个答案: