https://issues.apache.org/bugzilla/show_bug.cgi?id=54604
Bug ID: 54604
Summary: NPE at InternalInputBuffer.java while using
AsyncContext
Product: Tomcat Connectors
Version: unspecified
Hardware: All
Status: NEW
Severity: blocker
Priority: P2
Component: Common
Assignee: dev@tomcat.apache.org
Reporter: speakto...@gmail.com
Classification: Unclassified
Hi Friend,
I am getting following NPE, while I am using AsyncContext in the below
mentioned scenario.
Scenario :
I have introduced 1 sec delay inside the while loop after every readLine() call
from BufferedReader. This is causing the below error. Please note that, it is
working fine if I am not using AsyncContext with the same read delay value( 1
sec). Hence I am suspecting this problem is related to AsyncContext.
Server side code snippet in my servlet is shown below :
...........................................................
AsyncContext ctx = request.startAsync();
BufferedReader br = new BufferedReader(new
InputStreamReader(ctx.getRequest().getInputStream()));
String line=null;
while((line= br.readLine())!=null)
{
System.out.println(line);
Thread.sleep(1000);
}
...........................................................
Client side code snippet to send 50 MB of data in a HttpPost request
.............................................................
org.apache.commons.httpclient.HttpClient client = new
org.apache.commons.httpclient.HttpClient();
String fileName = "F:\\SampleFile_50MBData";
FileInputStream is= new FileInputStream(fileName);
PostMethod postMethod = new
PostMethod("http://localhost:8080/async-read-delay/test";);
postMethod.setRequestEntity(new InputStreamRequestEntity(is,-1));
int response = client.executeMethod(postMethod);
is.close();
.............................................................
Exception in thread "http-bio-8080-exec-2" java.lang.NullPointerException
at
org.apache.coyote.http11.InternalInputBuffer.fill(InternalInputBuffer.java:516)
at
org.apache.coyote.http11.InternalInputBuffer.fill(InternalInputBuffer.java:501)
at
org.apache.coyote.http11.InternalInputBuffer$InputStreamInputBuffer.doRead(InternalInputBuffer.java:563)
at
org.apache.coyote.http11.AbstractInputBuffer.doRead(AbstractInputBuffer.java:344)
at org.apache.coyote.Request.doRead(Request.java:422)
at
org.apache.catalina.connector.InputBuffer.realReadBytes(InputBuffer.java:290)
at org.apache.tomcat.util.buf.ByteChunk.substract(ByteChunk.java:431)
at org.apache.catalina.connector.InputBuffer.read(InputBuffer.java:315)
at
org.apache.catalina.connector.CoyoteInputStream.read(CoyoteInputStream.java:200)
at sun.nio.cs.StreamDecoder.readBytes(Unknown Source)
at sun.nio.cs.StreamDecoder.implRead(Unknown Source)
at sun.nio.cs.StreamDecoder.read(Unknown Source)
at java.io.InputStreamReader.read(Unknown Source)
at java.io.BufferedReader.fill(Unknown Source)
at java.io.BufferedReader.readLine(Unknown Source)
at java.io.BufferedReader.readLine(Unknown Source)
at test.TestAsyncFilter.readContent(TestAsyncFilter.java:82)
at test.TestAsyncFilter.access$0(TestAsyncFilter.java:66)
at test.TestAsyncFilter$1.run(TestAsyncFilter.java:53)
at
org.apache.catalina.core.AsyncContextImpl$RunnableWrapper.run(AsyncContextImpl.java:474)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Note : I have tested this in Tomcat 7.0.29. Also the same issue is seen since
Tomcat 7.0.21. if I remove the time delay of 1 sec, it is working fine.
Let me know, if there is any fix is available for this problem.
Regards,
Prakasaraman.V
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