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我試圖訪問該網站UNIPROT檢索蛋白質序列與他們的個人資料爲XML文件的列表。文件大小很大。我正在使用JBPM full package附帶的eclipse。另外，我在虛擬盒子下使用Ubuntu。現在，當我運行代碼，我得到這個堆棧跟蹤：需要解決這個問題：java.io.IOException異常：早產EOF
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
任何一個可以幫助如何解決這個錯誤還是什麼原因的呢？
這裏是生成錯誤的代碼：
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;
}
某些Java代碼如何？ – Michael
你不需要每次在該循環周圍分配一個新的緩衝區，這只是詛咒GC死亡。您可以將'new String（buffer）.substring（0，read）'重寫爲'new String（buffer，0，read）'。 – EJP