Wiki source code of Debugging

Version 38.1 by Vincent Massol on 2019/03/23 19:28

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1 There are several possibilities for debugging XWiki:
2
3 {{toc/}}
4
5 = Debug mode =
6
7 [Since 7.1]
8
9 It's possible to enable debug log by adding ##debug=true## (as in [[http://127.0.0.1:8080/xwiki/bin/Main/WebHome?debug=true]]) to the URL. This provide various details on what exactly happens during the request.
10
11 == Elapsed time tree ==
12
13 A detailed tree of how long has been spent in each step. You can add you own step to the tree by using [[progress API>>extensions:Extension.Job Module||anchor="HNotifyaboutprogress"]].
14
15 {{image reference="elapsedtimetree.png"/}}
16
17 = Debugging XWiki from your IDE =
18
19 == Debugging with Eclipse ==
20
21 Once you've gotten the debugger working, you'll wonder how you ever survived without it.
22
23 === Complete tutorial based on M2Eclipse and WTP ===
24
25 [[Debug XWiki with Eclipse>>DebugXEWithEclipse]]
26
27 === Debug a XWiki released version ===
28
29 * Follow the steps from [[Building In Eclipse>>BuildingInEclipse]] including the optional "Import the WAR as a web project".
30 * Select from the Eclipse menu **Run > Debug...**
31 * Create a new configuration for your server
32 * Hit the **Debug** button
33 * Set breakpoints, step through code, have fun!
34
35 WTP will deploy XWiki into ##{workspace_location}/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/webapps/xwiki##. If you suspect a change has not been deployed correctly (e.g. a change to a config file), check there to confirm.
36
37 If you are working on an XWiki plugin in a separate project in your workspace, you can ensure it is automatically deployed to XWiki's ##WEB-INF/lib## directory when debugging. Open the project properties of the XWiki project resulting from the WAR import above, go to the ##J2EE Module Dependencies## section, and add your plugin project.
38
39 === Using Firebug when debugging a selenium test ===
40
41 For that you will need to install Firebug [[as a global extension>>http://kb.mozillazine.org/Installing_extensions#Global_installation]]
42
43 = Remote Debugging =
44
45 To perform remote debugging, start your wiki in debug mode. To do this modify the way you start your container and ensure that the following JVM parameters are passed:
46
47 {{code}}
48 -Xdebug -Xnoagent -Djava.compiler=NONE -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=5005
49 {{/code}}
50
51 For example, for Jetty you could use the following start script:
52
53 {{code}}
54 #!/bin/sh
55
56 JETTY_HOME=.
57 JETTY_PORT=8080
58 JAVA_OPTS="-Xmx300m -Xdebug -Xnoagent -Djava.compiler=NONE -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=5005"
59
60 java $JAVA_OPTS -Dfile.encoding=iso-8859-1 -Djetty.port=$JETTY_PORT -Djetty.home=$JETTY_HOME -jar $JETTY_HOME/start.jar
61 {{/code}}
62
63 {{info}}
64 You can also easily run Jetty in debug mode by using the [[jettyrun profile in the Maven build>>Building#HUsingProfiles]].
65 {{/info}}
66
67 If you are using the Tomcat service on Windows, you should modify the JVM args with the Tomcat Service Configuration Panel. Select the Java tab and add each of the options **on a separate line**. For example:
68
69 {{code}}
70 -Dcatalina.home=C:\Program Files\Apache Software Foundation\Tomcat 5.5
71 -Dcatalina.base=C:\Program Files\Apache Software Foundation\Tomcat 5.5
72 -Djava.endorsed.dirs=C:\Program Files\Apache Software Foundation\Tomcat 5.5\common\endorsed
73 -Djava.io.tmpdir=C:\Program Files\Apache Software Foundation\Tomcat 5.5\temp
74 -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
75 -Djava.util.logging.config.file=C:\Program Files\Apache Software Foundation\Tomcat 5.5\conf\logging.properties
76 -Xdebug
77 -Xnoagent
78 -Djava.compiler=NONE
79 -Xrunjdwp:transport=dt_socket,address=8000,server=y,suspend=n
80 {{/code}}
81
82 Then, in your favorite IDE, open the XWiki project and run a remote debugging session, attached to the socket on port 5005. For example, if you're using IntelliJ IDEA, go to ##Run|Edit Configurations...## and create a new ##Remote## configuration (default parameters should be fine). Then execute it and IDEA will connect to the executing JVM.
83
84 You can then place breakpoints in your source code.
85
86 = Logging =
87
88 == Turning on logging inside XWiki ==
89
90 See the [[Logging page in the Admin guide>>platform:AdminGuide.Logging]].
91
92 == Logging shutdown operations ==
93
94 {{info}}XWiki 6.3M1+{{/info}} To log debug information of what happens when there are shutdown operations, simply set the log level to ##DEBUG## for the ##org.xwiki.shutdown## logger:
95
96 {{code language="xml"}}
97 <logger name="org.xwiki.shutdown" level="info"/>
98 {{/code}}
99
100 == Logging calls at the database level ==
101
102 You have several options:
103
104 * Configure Hibernate to log SQL calls. To do this edit XWiki's log configuration file (see the [[Logging page>>platform:AdminGuide.Logging]]) and change the log level from ##warn## to ##trace## for the following:(((
105 {{code language="none"}}
106 <!-- Log HQL query parser activity -->
107 <logger name="org.hibernate.hql.ast.AST" level="warn"/>
108 <!-- Log just the SQL -->
109 <logger name="org.hibernate.SQL" level="warn"/>
110 <!-- Log JDBC bind parameters -->
111 <logger name="org.hibernate.type" level="warn"/>
112 <!-- Log schema export/update -->
113 <logger name="org.hibernate.tool.hbm2ddl" level="warn"/>
114 <!-- Log HQL parse trees -->
115 <logger name="org.hibernate.hql" level="warn"/>
116 <!-- Log cache activity -->
117 <logger name="org.hibernate.cache" level="warn"/>
118 <!-- Log transaction activity -->
119 <logger name="org.hibernate.transaction" level="warn"/>
120 <!-- Log JDBC resource acquisition -->
121 <logger name="org.hibernate.jdbc" level="warn"/>
122 <!-- Enable the following line if you want to track down connection leakages when using
123 DriverManagerConnectionProvider -->
124 <logger name="org.hibernate.connection.DriverManagerConnectionProvider" level="warn"/>
125 <!-- Log prepared statement cache activity -->
126 <logger name="org.hibernate.ps.PreparedStatementCache" level="warn"/>
127 {{/code}}
128 )))
129 * Use a wrapping JDBC driver such as [[log4jdbc>>http://code.google.com/p/log4jdbc/]] or [[p6spy>>http://sourceforge.net/projects/p6spy/]].
130 * Turn on logging in your database. The configuration is database-dependent
131 ** For **HSQLDB**. Two solutions:
132 *** Solution 1: Edit ##WEB-INF/hibernate.cfg.xml## and modify the URL connection property to add ##hsqldb.sqllog=3##, as in:(((
133 {{code language="none"}}
134 <property name="connection.url">jdbc:hsqldb:file:${environment.permanentDirectory}/database/xwiki_db;shutdown=true;hsqldb.sqllog=3</property>
135 {{/code}}
136 )))
137 *** Solution 2: Using Byteman (See the section below for more information). For example the following rule (tested on HSQLDB 2.3.1) will log SQL statements with parameters and schema when there's more than 1 parameter:(((
138 {{code language="none"}}
139 RULE Log SQL Statement
140 CLASS org.hsqldb.Session
141 METHOD executeCompiledStatement(org.hsqldb.Statement, Object[], int)
142 AT ENTRY
143 IF $2.length > 0
144 DO traceln("SQL Statement = [" + $1.getSQL() + "], parameter 1 = [" + $2[0] + "], schema = [" + $1.getSchemaName().name + "]")
145 ENDRULE
146 {{/code}}
147
148 Will give for example:
149
150 {{code language="none"}}
151 SQL Statement = [select xwikidocum0_.XWD_ID as XWD1_0_0_, xwikidocum0_.XWD_FULLNAME as XWD2_0_0_, xwikidocum0_.XWD_NAME as XWD3_0_0_, xwikidocum0_.XWD_TITLE as XWD4_0_0_, xwikidocum0_.XWD_LANGUAGE as XWD5_0_0_, xwikidocum0_.XWD_DEFAULT_LANGUAGE as XWD6_0_0_, xwikidocum0_.XWD_TRANSLATION as XWD7_0_0_, xwikidocum0_.XWD_DATE as XWD8_0_0_, xwikidocum0_.XWD_CONTENT_UPDATE_DATE as XWD9_0_0_, xwikidocum0_.XWD_CREATION_DATE as XWD10_0_0_, xwikidocum0_.XWD_AUTHOR as XWD11_0_0_, xwikidocum0_.XWD_CONTENT_AUTHOR as XWD12_0_0_, xwikidocum0_.XWD_CREATOR as XWD13_0_0_, xwikidocum0_.XWD_WEB as XWD14_0_0_, xwikidocum0_.XWD_CONTENT as XWD15_0_0_, xwikidocum0_.XWD_VERSION as XWD16_0_0_, xwikidocum0_.XWD_CUSTOM_CLASS as XWD17_0_0_, xwikidocum0_.XWD_PARENT as XWD18_0_0_, xwikidocum0_.XWD_CLASS_XML as XWD19_0_0_, xwikidocum0_.XWD_ELEMENTS as XWD20_0_0_, xwikidocum0_.XWD_DEFAULT_TEMPLATE as XWD21_0_0_, xwikidocum0_.XWD_VALIDATION_SCRIPT as XWD22_0_0_, xwikidocum0_.XWD_COMMENT as XWD23_0_0_, xwikidocum0_.XWD_MINOREDIT as XWD24_0_0_, xwikidocum0_.XWD_SYNTAX_ID as XWD25_0_0_, xwikidocum0_.XWD_HIDDEN as XWD26_0_0_ from xwikidoc xwikidocum0_ where xwikidocum0_.XWD_ID=?], parameter 1 = [-4526159677276379501], schema = [TEST91]
152 {{/code}}
153 )))
154
155 == Logging HTTP calls ==
156
157 XWiki uses [[HTTP Client>>https://hc.apache.org/httpcomponents-client-ga/]] in most places and logging what it does is easy. You'll need to add the following to XWiki's ##logback.xml## file:
158
159 {{code language="xml"}}
160 <logger name="org.apache.http" level="debug"/>
161 <logger name="org.apache.http.headers" level="debug"/>
162 <logger name="org.apache.http.wire" level="debug"/>
163 {{/code}}
164
165 == Using Byteman ==
166
167 [[Byteman>>https://www.jboss.org/byteman]] is a great framework that allows to modify bytecode in a running JVM. It can easily be used to add logging (for ex) to find out what's happening in a running XWiki instance. Here's a quick tutorial:
168
169 * Download Byteman and unzip it in a directory. Set the ##$BYTEMAN_HOME## environment property to point to the directory where you've unzipped it. For example:
170 {{code}}export BYTEMAN_HOME=/Users/vmassol/dev/byteman/byteman-download-2.1.0{{/code}}
171 * Start an XWiki instance somewhere on the same machine
172 * Go to ##$BYTEMAN_HOME/bin## and connect Byteman to XWiki. For example:
173 {{code}}sh bminstall.sh -b -Dorg.jboss.byteman.transform.all jetty/start.jar{{/code}}
174 * Now create a Byteman rule by creating a file, for example ##my.btm## with the following:(((
175 {{code}}
176 RULE XWiki Docs loaded
177 CLASS XWikiHibernateStore
178 METHOD loadXWikiDoc
179 AT ENTRY
180 IF TRUE
181 DO traceln("Load document = " + $1.getDocumentReference())
182 ENDRULE
183 {{/code}}
184 )))
185 * Load this rule with: {{code}}sh bmsubmit.sh -l my.btm{{/code}}
186 * Call a URL in your wiki and check that the console prints the document references that get loaded! For example:(((
187 {{code}}
188 Load document = xwiki:Main.WebPreferences
189 Load document = xwiki:ColorThemes.DefaultColorTheme
190 Load document = xwiki:XWiki.SearchSuggestConfig
191 Load document = xwiki:XWiki.SearchSuggestConfig
192 Load document = xwiki:Dashboard.WebHome
193 Load document = xwiki:XWiki.GadgetClass
194 Load document = xwiki:Dashboard.WebHome
195 Load document = xwiki:Dashboard.WebPreferences
196 Load document = xwiki:Dashboard.colibri
197 Load document = xwiki:Main.Welcome
198 ...
199 {{/code}}
200 )))
201 * Modify your rule or add new rules to the same file and apply the changes with {{code}}sh bmsubmit.sh -l my.btm{{/code}}
202 * Remove your rules with {{code}}sh bmsubmit.sh -u{{/code}}
203
204 For more read [[A Byteman tutorial>>https://community.jboss.org/wiki/ABytemanTutorial]] or the [[Reference documentation>>http://downloads.jboss.org/byteman/2.0.1/ProgrammersGuideSinglePage.html]].
205
206 === Example ===
207
208 In this example we'll print calls to ##CommonsConfigurationSource.containsKey(...)## with the parameters printed and the time it takes to execute. In addition we'll also print calls to ##XWiki.getDocument(String, XWikiContext)## which is a deprecated method which, for the purpose of this example, we think generate the calls to ##containsKey##.
209
210 {{code}}
211 RULE Create timer for containsKey
212 CLASS CommonsConfigurationSource
213 METHOD containsKey
214 AT ENTRY
215 IF TRUE
216 DO resetTimer("containsKey")
217 ENDRULE
218
219 RULE Calls to containsKey
220 CLASS CommonsConfigurationSource
221 METHOD containsKey
222 AT EXIT
223 IF TRUE
224 DO traceln("containsKey for [" + $1 + "] = [" + $! + "], time = [" + getElapsedTimeFromTimer("containsKey") + "]")
225 ENDRULE
226
227 RULE Calls to deprecated getDocument
228 CLASS com.xpn.xwiki.XWiki
229 METHOD getDocument(String, XWikiContext)
230 AT ENTRY
231 IF TRUE
232 DO traceStack("getDocument() called for [" + $1 + "] ", 3)
233 ENDRULE
234 {{/code}}
235
236 Generates:
237
238 {{code}}
239 ...
240 getDocument() called for [XWiki.Admin] com.xpn.xwiki.XWiki.getDocument(XWiki.java:-1)
241 com.xpn.xwiki.XWiki.getUserName(XWiki.java:5072)
242 com.xpn.xwiki.XWiki.getUserName(XWiki.java:5062)
243 . . .
244 containsKey for [model.reference.default.document] = [false], time = [0]
245 containsKey for [model.reference.default.document] = [false], time = [0]
246 containsKey for [model.reference.default.space] = [false], time = [0]
247 containsKey for [model.reference.default.space] = [false], time = [0]
248 containsKey for [model.reference.default.wiki] = [false], time = [0]
249 containsKey for [model.reference.default.wiki] = [false], time = [1]
250 getDocument() called for [XWiki.DefaultSkin] com.xpn.xwiki.XWiki.getDocument(XWiki.java:-1)
251 com.xpn.xwiki.XWiki.getSkinFile(XWiki.java:1955)
252 com.xpn.xwiki.XWiki.getSkinFile(XWiki.java:1918)
253 . . .
254 ...
255 {{/code}}
256
257 === Troubleshooting ===
258
259 ==== NoClassDefFoundError: com/sun/tools/attach/AttachNotSupportedException ====
260
261 If you get the following exception, it can mean that you're on Mac and that your ##tools.jar## is not added to the classpath. Apparently ##bminstall.sh## thinks that if you're on Mac then you don't need ##tools.jar## which is apparently wrong nowadays.
262
263 {{code language='none'}}
264 Exception in thread "main" java.lang.NoClassDefFoundError: com/sun/tools/attach/AttachNotSupportedException
265 at java.lang.Class.getDeclaredMethods0(Native Method)
266 at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
267 at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
268 at java.lang.Class.getMethod0(Class.java:3018)
269 at java.lang.Class.getMethod(Class.java:1784)
270 at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544)
271 at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526)
272 Caused by: java.lang.ClassNotFoundException: com.sun.tools.attach.AttachNotSupportedException
273 at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
274 at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
275 at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
276 at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
277 ... 7 more
278 {{/code}}
279
280 In this case, edit ##bminstall.sh## and add the following line below the ##OS=`uname`## line in order to override it:
281
282 {{code language='none'}}
283 OS=whatever
284 {{/code}}
285
286 = Debugging JavaScript =
287
288 The solution is to use a Browser add-on for inspecting JavaScript and putting breakpoints in it. The issue is that by default the XWiki build will minify and aggregate JavaScript files for performance reasons.
289
290 However there's a solution:
291
292 * Start by building XWiki with the ##debug## profile (##mvn clean install -Pdebug##)
293 * Then once you're on a page make sure to pass ##?minify=false## in the URL. If you don't do this then the aggregated JS files are going to be referenced and since they don't exist, the JS code will break. Since 7.1 you can instead set ##debug.minify## to ##false## in ##xwiki.properties## file.
294
295 = Debugging the WYSIWYG editor =
296
297 Example to debug JS code in ##macroSelector.js##:
298
299 * Modify the top level CKEditor ##pom.xml## to remove minification (the important part is {{code}}--leave-js-unminified{{/code}}):(((
300 {{code language="xml"}}
301 ...
302 <plugin>
303 <groupId>org.codehaus.mojo</groupId>
304 <artifactId>exec-maven-plugin</artifactId>
305 <executions>
306 <!-- Build the CKEditor. -->
307 <execution>
308 <id>build-ckeditor</id>
309 <!-- Use a phase after compile because the Clirr Maven Plugin executes all the phases up to compile twice. -->
310 <phase>process-classes</phase>
311 <goals>
312 <goal>exec</goal>
313 </goals>
314 <configuration>
315 <executable>${ckeditor.builder.path}/build.sh</executable>
316 <arguments>
317 <argument>-s --leave-js-unminified</argument>
318 </arguments>
319 </configuration>
320 </execution>
321 </executions>
322 </plugin>
323 ...
324 {{/code}}
325 )))
326 * Rebuild the ##application-ckeditor-webjar## module (you'll also need to rebuild##application-ckeditor-plugins## if you made changes to it).
327 * Copy the generated ##application-ckeditor-webjar-<version>.jar## to an XWiki instance, in ##WEB-INF/lib## and restart XWiki
328 * In the wiki, edit ##CKEditor.EditSheet## in object mode and look for ###set ($macroWizardBundlePath = "${ckeditorBasePath}plugins/xwiki-macro/macroWizard.bundle.min")## and remove the ##.min## part. Note that in this case you have to know that the macro wizard is loaded separately in ##macroWizard.bundle.min.js##. Otherwise the JS is in ##ckeditor.js##.
329 * Use your browser's dev tools to put breakpoints in the JS.
330
331 = Analyze Out Of Memory issues =
332
333 You can enable automatic memory dump when using ##-XX:+HeapDumpOnOutOfMemoryError## which will generate a memory dump as soon as Java detect an Out Of memory error.
334
335 Since 7.2RC1 the option is enabled by default in Jetty based distributions and the memory dump will ends up in ##data/## folder.

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