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

recordstore ioexception java-me netbeans java

David Z · 技术社区 · 15 年前

我正在尝试用J2ME编写一个使用 javax.microedition.rms.RecordStore 存储持久数据。我正在Gentoo上的NetBeans 6.0和J2ME 2.2中开发这个项目。当我尝试运行项目时,我会得到一个错误,因为显然无法创建记录存储。下面是一个输出示例,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)

我找到了一个链接认为是 RecordStore ,如果引发异常: http://jcs.mobile-utopia.com/jcs/78052_RecordStore.java . 相关的线在底部附近,基本上是这样的:

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

因此,这意味着当NetBeans试图创建记录存储文件时,会触发IOException。但为什么会这样呢?不幸的是,输出对创建记录存储失败的确切原因保持沉默。有人知道可能出了什么问题,或者关于NetBeans如何处理的问题吗? 记录存储 内部的?

下面是我的代码中触发错误的构造函数,如果相关的话:

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?

1 回复 | 直到 15 年前

David Z 15 年前

我跑

strace netbeans-6.0

并在应用程序抛出错误时观察输出中是否出现文件名。

[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 把它定到0777就解决了这个问题。