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| <title>Chapter 1. Messages</title><link rel="stylesheet" href="aspectj-docs.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.44"><link rel="home" href="index.html" title="The AspectJtm Problem Diagnosis Guide"><link rel="up" href="index.html" title="The AspectJtm Problem Diagnosis Guide"><link rel="previous" href="index.html" title="The AspectJtm Problem Diagnosis Guide"><link rel="next" href="messages-scenarios.html" title="Message scenarios"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 1. Messages</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="index.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="messages-scenarios.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><h2 class="title"><a name="messages"></a>Chapter 1. Messages</h2></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><a href="messages.html#messages-introduction">Introduction</a></dt><dd><dl><dt><a href="messages.html#messages-introduction-config">Configuring Messages</a></dt></dl></dd><dt><a href="messages-scenarios.html">Message scenarios</a></dt><dd><dl><dt><a href="messages-scenarios.html#messages-scenarios-ct">Compile-time weaving scenarios</a></dt><dt><a href="messages-scenarios.html#messages-scenarios-ltw">Load-time weaving scenarios</a></dt></dl></dd><dt><a href="messages-xlint.html">Lint messages</a></dt></dl></div><div class="sect1"><a name="messages-introduction"></a><div class="titlepage"><div><h2 class="title" style="clear: both"><a name="messages-introduction"></a>Introduction</h2></div></div><p> | |
| Messages point out potential problems in the input program; some | |
| are clearly problems (errors), but many more may depend on what | |
| the programmer intends. To keep the noise down the latter are treated | |
| as warnings which can be ignored by the programmer or information | |
| which are hidden. However, when investigating | |
| unexpected behavior it's helpful to show them. This section describes how | |
| to configure messages, presents some problem scenarios when | |
| compiling or doing load-time weaving, and summarizes some of the | |
| more relevant messages. | |
| </p><div class="sect2"><a name="messages-introduction-config"></a><div class="titlepage"><div><h3 class="title"><a name="messages-introduction-config"></a>Configuring Messages</h3></div></div><p> | |
| The compiler offers <tt>-verbose</tt>, | |
| <tt>-warning</tt>, and <tt>-XLint</tt> options | |
| when invoked using the command-line, Ant, or embedded in an IDE. | |
| All options are listed in the AspectJ Development Environment Guide | |
| sections for | |
| <a href="../devguide/ajc-ref.html" target="_top">Ajc</a> and | |
| <a href="../devguide/antTasks-iajc.html" target="_top">Ant Tasks</a>. | |
| The <a href="../devguide/ltw.html" target="_top">Load-time Weaving</a> | |
| section describes how to use XML configuration files and | |
| system properties to pass options to the weaver. (You can also | |
| pass options to the weaver using system properties in build- | |
| time weaving.) | |
| The <tt>-verbose</tt> option has the effect of including | |
| messages level "info", which are normally ignored. | |
| Both <tt>warning</tt> and <tt>XLint</tt> | |
| enable you to identify specific messages to emit, but warning | |
| messages tend to be the same provided by the underlying Eclipse | |
| JDT (Java) compiler, while XLint messages are emitted by the | |
| AspectJ compiler or weaver. Obviously, during load-time weaving | |
| only weaver messages will be emitted. Similarly, if aspects | |
| are compiled but not woven, then only compiler messages will be | |
| emitted. However, the usual case for the compiler/weaver working | |
| at build time is to emit both compiler and weaver messages. | |
| </p><p> The tables below list some options, System Properties (for LTW only) and Java 5 annotations | |
| used to control AspectJ messages. The method | |
| of configuration depends on your environment so please refer to the relevant | |
| documentation for | |
| <a href="../devguide/ajc-ref.html" target="_top">ajc</a>, | |
| <a href="../devguide/antTasks.html" target="_top">Ant</a> or | |
| <a href="../devguide/ltw-configuration.html#weaver-options" target="_top">LTW</a>. | |
| </p><p> | |
| <div class="informaltable" id="d0e95"><a name="d0e95"></a><table border="1"><colgroup><col><col></colgroup><thead><tr><th>Option</th><th>Description</th></tr></thead><tbody><tr><td><tt>-verbose</tt></td><td> | |
| Show informational messages including AspectJ version | |
| and build date. | |
| </td></tr><tr><td><tt>-debug</tt></td><td> | |
| (Load-time weaving only). Show debugging messages such as | |
| which classes are being woven or those that are excluded. | |
| (This is not related to the compiler -g option to | |
| include debug information in the output .class files.) | |
| </td></tr><tr><td><tt>-showWeaveInfo</tt></td><td> | |
| Show weaving messages. | |
| </td></tr><tr><td><tt>-Xlint</tt></td><td> | |
| Control level of lint messages. | |
| </td></tr><tr><td><tt>messageHolderClass</tt>/ | |
| <tt>-XmessageHolderClass:</tt></td><td> | |
| In Ant tasks and LTW respectively specify the class to receive all messages. | |
| See | |
| <a href="../devguide/antTasks-iajc.html#antTasks-iajc-options" target="_top"> | |
| iajc task options</a> or | |
| <a href="../devguide/ltw-configuration.html#weaver-options" target="_top"> | |
| Weaver Options</a>. | |
| </td></tr></tbody></table></div> | |
| </p><p> | |
| <div class="informaltable" id="d0e147"><a name="d0e147"></a><table border="1"><colgroup><col><col></colgroup><thead><tr><th>System Property</th><th>Description</th></tr></thead><tbody><tr><td><tt>aj.weaving.verbose</tt></td><td> | |
| Show informational messages including AspectJ version and build date | |
| (same as <tt>-verbose</tt> option). | |
| </td></tr><tr><td><tt>org.aspectj.weaver.showWeaveInfo</tt></td><td> | |
| Show weaving messages | |
| (same as <tt>-showWeaveInfo</tt> option). | |
| </td></tr><tr><td><tt>org.aspectj.weaving.messages</tt></td><td> | |
| Set this system property to enable tracing of all compiler | |
| messages. See <a href="trace.html#trace-configuration">Configuring Tracing</a>. | |
| </td></tr></tbody></table></div> | |
| </p><p> | |
| <div class="informaltable" id="d0e185"><a name="d0e185"></a><table border="1"><colgroup><col><col></colgroup><thead><tr><th>Annotation</th><th>Description</th></tr></thead><tbody><tr><td><tt>@SuppressAjWarnings</tt></td><td> | |
| Include this is Java 5 code to suppress AspectJ | |
| warnings associated with the next line of code. | |
| </td></tr></tbody></table></div> | |
| </p></div></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="index.html">Prev</a> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right"> <a accesskey="n" href="messages-scenarios.html">Next</a></td></tr><tr><td width="40%" align="left">The AspectJ<sup>tm</sup> Problem Diagnosis Guide </td><td width="20%" align="center"><a accesskey="u" href="index.html">Up</a></td><td width="40%" align="right"> Message scenarios</td></tr></table></div></body></html> |