JBWEB-216: Fix concurrency issue with sharing InputStreams in JBossWeb

SHORT DESCRIPTION:         Provide fix for JBWEB-216. LONG DESCRIPTION:         Patch to fix Apache BZ #48760 -- Fix concurrency issue with sharing InputStreams MANUAL INSTALL INSTRUCTIONS:         Replace the existing %JBOSS_HOME%/server/%JBOSSCONF%/deploy/jbossweb.sar/jbossweb.jar with the new jbossweb.jar COMPATIBILITY:        5.1.2 SUPERSEDES:         N/A CREATOR:         Kyle Lape/Mike Millson DATE:         25-October-2011

There was a concurrency issue in Tomcat. When the <systemitem>javax.servlet.ServletOutputStream.write</systemitem> method got accessed by multiple threads, it sometimes got called while the previous thread had not yet finished writing of the byte buffer, or when its own buffer had not yet been flushed. This resulted in corrupted output and the following exception was thrown: <screen> SEVERE: Servlet.service() for servlet default threw exception java.io.IOException: Bad file number at java.io.FileInputStream.readBytes(Native Method) at java.io.FileInputStream.read(FileInputStream.java:199) at java.io.BufferedInputStream.read1(BufferedInputStream.java:256) at java.io.BufferedInputStream.read(BufferedInputStream.java:317) at java.io.FilterInputStream.read(FilterInputStream.java:90) at org.apache.catalina.servlets.DefaultServlet.copyRange(DefaultServlet.java:1968) at org.apache.catalina.servlets.DefaultServlet.copy(DefaultServlet.java:1714) at org.apache.catalina.servlets.DefaultServlet.serveResource(DefaultServlet.java:809) at org.apache.catalina.servlets.DefaultServlet.doGet(DefaultServlet.java:325) at javax.servlet.http.HttpServlet.service(HttpServlet.java:690) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) </screen> This update modifies the underlying source code and ensures that such concurrency is avoided. The <systemitem>javax.servlet.ServletOutputStream.write</systemitem> method can now be accessed by multiple threads without causing the previously mentioned issue.