JBoss hits a NullPointerException in JavacErrorDetail trying to report a JSP compilation exception

Issue

• JBoss is failing to compile our JSPs, but we aren't able to determine why because JBoss just logs the following NPE instead of a useful exception indicating the original issue causing compilation to fail:

ERROR [STDERR] (http-127.0.0.1-8080-1) java.lang.NullPointerException
    at java.io.Reader.<init>(Reader.java:61)
    at java.io.InputStreamReader.<init>(InputStreamReader.java:55)
    at org.apache.jasper.compiler.JavacErrorDetail.readFile(JavacErrorDetail.java:204)
    at org.apache.jasper.compiler.JavacErrorDetail.<init>(JavacErrorDetail.java:99)
    at org.apache.jasper.compiler.ErrorDispatcher.createJavacError(ErrorDispatcher.java:542)
    at org.apache.jasper.compiler.JDTCompiler$2.acceptResult(JDTCompiler.java:377)
    at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:398)
    at org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:429)
    at org.apache.jasper.compiler.Compiler.compile(Compiler.java:335)
    at org.apache.jasper.compiler.Compiler.compile(Compiler.java:313)
    at org.apache.jasper.compiler.Compiler.compile(Compiler.java:300)
    at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:585)