java - 需要修复此: java. io.IOException:过早的EOF

Question

这个问题不太可能对任何 future 的访客有帮助；它只与一个较小的地理区域、一个特定的时间点或一个非常狭窄的情况相关，通常不适用于全世界的互联网受众。如需帮助使此问题更广泛适用， visit the help center 。

已关闭 11 年前。

我正在尝试访问 uniprot 网站以检索蛋白质序列列表及其配置文件(XML 文件)。文件大小很大。我正在使用 JBPM 完整包附带的 eclipse。另外，我在虚拟盒子下使用ubuntu。现在，当我运行代码时，我得到了这个堆栈跟踪:

 java.io.IOException: Premature EOF
    at sun.net.www.http.ChunkedInputStream.fastRead(ChunkedInputStream.java:234)
    at sun.net.www.http.ChunkedInputStream.read(ChunkedInputStream.java:662)
    at java.io.FilterInputStream.read(FilterInputStream.java:116)
    at sun.net.www.protocol.http.HttpURLConnection$HttpInputStream.read(HttpURLConnection.java:2512)
    at edu.uga.uniprot.amna.QueryExecuter.ExecuteQuery(QueryExecuter.java:40)
    at edu.uga.uniprot.amna.Uniprot.getProteenStringByDFamily(Uniprot.java:40)
    at edu.uga.uniprot.amna.Uniprot.getProteensByDFamily(Uniprot.java:55)
    at org.drools.bpmn2.Process_org_drools_bpmn2_Hello_World_0.action4(Process_org_drools_bpmn2_Hello_World_0.java:60)
    at org.drools.bpmn2.Process_org_drools_bpmn2_Hello_World_0Action4Invoker.execute(Process_org_drools_bpmn2_Hello_World_0Action4Invoker.java:14)
    at org.jbpm.workflow.instance.node.ActionNodeInstance.internalTrigger(ActionNodeInstance.java:47)
    at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:122)
    at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerConnection(NodeInstanceImpl.java:185)
    at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:150)
    at org.jbpm.workflow.instance.node.StartNodeInstance.triggerCompleted(StartNodeInstance.java:49)
    at org.jbpm.workflow.instance.node.StartNodeInstance.internalTrigger(StartNodeInstance.java:41)
    at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:122)
    at org.jbpm.ruleflow.instance.RuleFlowProcessInstance.internalStart(RuleFlowProcessInstance.java:35)
    at org.jbpm.process.instance.impl.ProcessInstanceImpl.start(ProcessInstanceImpl.java:188)
    at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.start(WorkflowProcessInstanceImpl.java:302)
    at org.jbpm.process.instance.ProcessRuntimeImpl.startProcessInstance(ProcessRuntimeImpl.java:154)
    at org.jbpm.process.instance.ProcessRuntimeImpl.startProcess(ProcessRuntimeImpl.java:124)
    at org.drools.common.AbstractWorkingMemory.startProcess(AbstractWorkingMemory.java:1095)
    at org.drools.impl.StatefulKnowledgeSessionImpl.startProcess(StatefulKnowledgeSessionImpl.java:306)
    at com.sample.ProcessTest.main(ProcessTest.java:49)
java.lang.RuntimeException: unable to execute Action
    at org.jbpm.workflow.instance.node.ActionNodeInstance.internalTrigger(ActionNodeInstance.java:49)
    at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:122)
    at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerConnection(NodeInstanceImpl.java:185)
    at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:150)
    at org.jbpm.workflow.instance.node.StartNodeInstance.triggerCompleted(StartNodeInstance.java:49)
    at org.jbpm.workflow.instance.node.StartNodeInstance.internalTrigger(StartNodeInstance.java:41)
    at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:122)
    at org.jbpm.ruleflow.instance.RuleFlowProcessInstance.internalStart(RuleFlowProcessInstance.java:35)
    at org.jbpm.process.instance.impl.ProcessInstanceImpl.start(ProcessInstanceImpl.java:188)
    at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.start(WorkflowProcessInstanceImpl.java:302)
    at org.jbpm.process.instance.ProcessRuntimeImpl.startProcessInstance(ProcessRuntimeImpl.java:154)
    at org.jbpm.process.instance.ProcessRuntimeImpl.startProcess(ProcessRuntimeImpl.java:124)
    at org.drools.common.AbstractWorkingMemory.startProcess(AbstractWorkingMemory.java:1095)
    at org.drools.impl.StatefulKnowledgeSessionImpl.startProcess(StatefulKnowledgeSessionImpl.java:306)
    at com.sample.ProcessTest.main(ProcessTest.java:49)
Caused by: java.lang.NullPointerException
    at java.io.StringReader.<init>(StringReader.java:33)
    at edu.uga.uniprot.amna.Uniprot.loadProteenFromString(Uniprot.java:117)
    at edu.uga.uniprot.amna.Uniprot.getProteensByDFamily(Uniprot.java:58)
    at org.drools.bpmn2.Process_org_drools_bpmn2_Hello_World_0.action4(Process_org_drools_bpmn2_Hello_World_0.java:60)
    at org.drools.bpmn2.Process_org_drools_bpmn2_Hello_World_0Action4Invoker.execute(Process_org_drools_bpmn2_Hello_World_0Action4Invoker.java:14)
    at org.jbpm.workflow.instance.node.ActionNodeInstance.internalTrigger(ActionNodeInstance.java:47)
    ... 14 more

谁能帮忙解决这个错误或者是什么原因造成的？

这是生成错误的代码:

public static String ExecuteQuery(String queryURL, boolean writeFile) { 

    URL url;

    try {

        System.out.println("Strat getting Data"); 

        String output = ""; 

        int read; 

        RandomAccessFile  file = null; 

        url = new URL(queryURL);

        HttpURLConnection connection =

                (HttpURLConnection) url.openConnection();



        connection.setRequestProperty("Content-Type", "application/xml");

        connection.connect();       



        //read the result from the server

        if(writeFile == true) { 

            file = new RandomAccessFile(fileName, "rw");

        } 

        InputStream stream = connection.getInputStream();

        byte[] buffer = new byte[1024]; 

        BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));



        while((read = stream.read(buffer, 0, 1024)) != -1) { 

            //System.out.println(new String(buffer)); 

            output = output + new String(buffer).substring(0, read); 

            if(writeFile == true) { 

                file.write(buffer, 0, read); 

            } 

            buffer = new byte[1024]; 

        }

        System.out.println(output); 

        return output; 

    } catch (MalformedURLException e) {

        // TODO Auto-generated catch block

        e.printStackTrace();

    } catch (IOException e) {

        // TODO Auto-generated catch block

        e.printStackTrace();

    } 

    return null; 

}

Answer 1

此错误是由于您将 null 值传递到 Uniprot.java 第 117 行的 new StringReader() 引起的。

您可以通过堆栈跟踪看到这一点:

Caused by: java.lang.NullPointerException
    at java.io.StringReader.<init>(StringReader.java:33)
    at edu.uga.uniprot.amna.Uniprot.loadProteenFromString(Uniprot.java:117)
    at edu.uga.uniprot.amna.Uniprot.getProteensByDFamily(Uniprot.java:58)

StringReader 的构造函数如下:

public StringReader(String   s) {
    this.str = s;
    this.length = s.length(); // line 33
}

查看更多StringReader .