[[ajcore]]
== AspectJ Core Files

[[ajcore-introduction]]
=== Introduction

When the compiler terminates abnormally, either because a particular
kind of message was issued or an exception was thrown, an AspectJ core
file will be produced. You will find it the working directory of the
compiler and it will have a name that contains the date and time that
the file was produced e.g. `ajcore.20060810.173655.626.txt`. The file
contains details of the problem such as the exception thrown as well as
information about the environment such as operating system and Java
version. When submitting a bug, include this file whenever it is
available.

[[configuration]]
==== Configuring dump files

By default AspectJ will only create an `ajcore` file when an unexpected
exception is thrown by the weaver or an `abort` message is issued.
However it is possible to disable this feature or enable files to be
produced under different circumstances. The table below lists the System
properties that can be used to configure `ajcore` files.

[cols=",,",options="header",]
|===
|Property |Default |Description
|`org.aspectj.weaver.Dump.exception` |`true` |Generate an `ajcore` files
when an exception thrown.

|`org.aspectj.weaver.Dump.condition` |`abort` |Message kind for which to
generate `ajcore` e.g. `error`.

|`org.aspectj.dump.directory` |`none` |The directory used for ajcore
files.
|===

[[ajcore-examples]]
==== AJCore File Examples

Below is an extract from an `ajcore` file. You will see details of the
dump configuration as well as the exception (with stack trace) that is
the source of the problem and any messages issued by the compiler. Most
importantly the exact version of AspectJ is included.

[source, text]
....
---- AspectJ Properties ---
AspectJ Compiler DEVELOPMENT built on Tuesday Jul 25, 2006 at 13:00:09 GMT
---- Dump Properties ---
Dump file: ajcore.20060810.173655.626.txt
Dump reason: java.lang.NoClassDefFoundError
Dump on exception: true
Dump at exit condition: abort
---- Exception Information ---
java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
    at org.aspectj.weaver.tools.CommonsTraceFactory.<init>(CommonsTraceFactory.java:17)
    at java.lang.Class.newInstance0(Native Method)
    at java.lang.Class.newInstance(Class.java:232)
    at org.aspectj.weaver.tools.TraceFactory.<clinit>(TraceFactory.java:35)
    at org.aspectj.weaver.World.<clinit>(World.java:114)
    at org.aspectj.ajdt.internal.core.builder.AjBuildManager.initBcelWorld(AjBuildManager.java:679)
    at org.aspectj.ajdt.internal.core.builder.AjBuildManager.doBuild(AjBuildManager.java:224)
    at org.aspectj.ajdt.internal.core.builder.AjBuildManager.batchBuild(AjBuildManager.java:164)
    at org.aspectj.ajdt.ajc.AjdtCommand.doCommand(AjdtCommand.java:112)
    at org.aspectj.ajdt.ajc.AjdtCommand.runCommand(AjdtCommand.java:60)
    at org.aspectj.tools.ajc.Main.run(Main.java:367)
    at org.aspectj.tools.ajc.Main.runMain(Main.java:246)
    at org.aspectj.tools.ajc.Main.main(Main.java:86)
---- System Properties ---
java.runtime.name=Java(TM) 2 Runtime Environment, Standard Edition
sun.boot.library.path=C:\jdk1.3.1_16\jre\bin
java.vm.version=1.3.1_16-b06
java.vm.vendor=Sun Microsystems Inc.
java.vendor.url=http://java.sun.com/
path.separator=;
java.vm.name=Java HotSpot(TM) Client VM
file.encoding.pkg=sun.io
java.vm.specification.name=Java Virtual Machine Specification
user.dir=C:\workspaces\org.aspectj\org.aspectj.ant.tests
java.runtime.version=1.3.1_16-b06
java.awt.graphicsenv=sun.awt.Win32GraphicsEnvironment
os.arch=x86
java.io.tmpdir=C:\DOCUME~1\IBM_user\LOCALS~1\Temp\
line.separator=

java.vm.specification.vendor=Sun Microsystems Inc.
java.awt.fonts=
os.name=Windows XP
java.library.path=C:\jdk1.3.1_16\jre\bin;...
java.specification.name=Java Platform API Specification
java.class.version=47.0
os.version=5.1
user.home=C:\Documents and Settings\IBM_user
user.timezone=Europe/London
java.awt.printerjob=sun.awt.windows.WPrinterJob
file.encoding=Cp1252
java.specification.version=1.3
java.class.path=C:\workspaces\org.aspectj\aj-build\dist\tools\lib\aspectjtools.jar
user.name=IBM_user
java.vm.specification.version=1.0
java.home=C:\jdk1.3.1_16\jre
user.language=en
java.specification.vendor=Sun Microsystems Inc.
awt.toolkit=sun.awt.windows.WToolkit
java.vm.info=mixed mode
java.version=1.3.1_16
java.ext.dirs=C:\jdk1.3.1_16\jre\lib\ext
sun.boot.class.path=C:\jdk1.3.1_16\jre\lib\rt.jar;...
java.vendor=Sun Microsystems Inc.
file.separator=\
java.vendor.url.bug=http://java.sun.com/cgi-bin/bugreport.cgi
sun.io.unicode.encoding=UnicodeLittle
sun.cpu.endian=little
user.region=GB
sun.cpu.isalist=pentium i486 i386
---- Command Line ---
-d
C:\workspaces\org.aspectj\org.aspectj.ant.tests\IncrementalAjcTaskTest-temp
-g:none
-deprecation
-noExit
-warn:-unusedImport
-nowarn
-XterminateAfterCompilation
-preserveAllLocals
-proceedOnError
-referenceInfo
-source
1.3
-target
1.1
-time
-verbose
-classpath
C:\workspaces\org.aspectj\org.aspectj.ant.tests\..\lib\test\aspectjrt.jar
-argfile
C:\workspaces\org.aspectj\taskdefs\testdata\default.lst
-messageHolder
org.aspectj.bridge.MessageHandler
---- Full Classpath ---
Empty
---- Compiler Messages ---
abort ABORT -- (NoClassDefFoundError) org/apache/commons/logging/LogFactory
org/apache/commons/logging/LogFactory
java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
    at org.aspectj.weaver.tools.CommonsTraceFactory.<init>(CommonsTraceFactory.java:17)
    at java.lang.Class.newInstance0(Native Method)
    at java.lang.Class.newInstance(Class.java:232)
    at org.aspectj.weaver.tools.TraceFactory.<clinit>(TraceFactory.java:35)
    at org.aspectj.weaver.World.<clinit>(World.java:114)
    at org.aspectj.ajdt.internal.core.builder.AjBuildManager.initBcelWorld(AjBuildManager.java:679)
    at org.aspectj.ajdt.internal.core.builder.AjBuildManager.doBuild(AjBuildManager.java:224)
    at org.aspectj.ajdt.internal.core.builder.AjBuildManager.batchBuild(AjBuildManager.java:164)
    at org.aspectj.ajdt.ajc.AjdtCommand.doCommand(AjdtCommand.java:112)
    at org.aspectj.ajdt.ajc.AjdtCommand.runCommand(AjdtCommand.java:60)
    at org.aspectj.tools.ajc.Main.run(Main.java:367)
    at org.aspectj.tools.ajc.Main.runMain(Main.java:246)
    at org.aspectj.tools.ajc.Main.main(Main.java:86)
....