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169 | <div class="lightbluebar"> </div>
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170 | <div class="main">
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171 | <div class="content">
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172 | <h1 class="title">Having Problems?</h1>
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173 | <h3 class="section">
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174 | <a name="Having Problems?"></a>
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175 | Having Problems?
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176 | </h3>
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177 | <p>
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178 | This page details some steps you can take to try and resolve
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179 | any problems you may be having with Ant. If you find you can't
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180 | resolve the problem, then this page will help you collect some of
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181 | the relevant information to provide in a bug report. This information
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182 | will help the Ant developers understand and resolve the problem.
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183 | Of course, not all the steps here will make sense for every problem
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184 | you may encounter - these are just some suggestions to point
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185 | you in the right direction.
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186 | </p>
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187 | <h4 class="subsection">
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188 | <a name="Ensure that you are actually running the version of Ant that you think you do"></a>
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189 | Ensure that you are actually running the version of Ant that you think you do
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190 | </h4>
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191 | <p>Many tools include a version of Ant and some Operating
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192 | Systems even install it by default now, so you may have a
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193 | version of Ant installed that you haven't been aware of.</p>
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194 | <p>One of the first things to do is to run
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195 | <br /><br />
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196 | <font face="verdana" size="-1">ant -version</font>
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197 | <br /><br />
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198 | and
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199 | <br /><br />
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200 | <font face="verdana" size="-1">ant -diagnostics</font>
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201 | <br /><br />
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202 | to be sure. Also, we highly recommend that you run Ant with
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203 | an empty CLASSPATH. If any other version of Ant can be
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204 | loaded from the CLASSPATH, many types of errors may happen
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205 | because of incompatible classes being loaded.</p>
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206 | <p>See <a href="faq.html">the FAQ</a> for <a href="faq.html#NoClassDefFoundError">some</a> <a href="faq.html#InstantiationException">examples</a>, but many
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207 | other problems are a result of an old version of Ant on your
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208 | system as well.</p>
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209 | <h4 class="subsection">
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210 | <a name="Read the Manual"></a>
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211 | Read the Manual
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212 | </h4>
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213 | <p>
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214 | The first step to take when you have a problem with Ant is to read
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215 | the <a href="manual/index.html">manual</a> entry for the task or
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216 | concept that is giving you trouble. In particular, check the
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217 | meaning of a task's attributes and nested elements. Perhaps an
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218 | attribute is available that would provide the behavior you require.
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219 | If you have problems with the manual itself, you can submit a
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220 | documentation bug report (see below) to help us improve the Ant
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221 | documentation.
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222 | </p>
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223 | <h4 class="subsection">
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224 | <a name="Examine Debug Output"></a>
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225 | Examine Debug Output
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226 | </h4>
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227 | <p>
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228 | If you're still having a problem, the next step is to try and
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229 | gather additional information about what Ant is doing.
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230 | Try running Ant with the <code>verbose</code> flag:
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231 | <br /><br />
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232 | <font face="verdana" size="-1">ant -verbose</font>
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233 | <br /><br />
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234 | or
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235 | <br /><br />
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236 | <font face="verdana" size="-1">ant -v</font>
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237 | <br /><br />
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238 |
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239 | This will produce output that starts like the following:</p>
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240 | <table class="ForrestTable" cellspacing="1" cellpadding="4">
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241 | <tr>
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242 | <td colspan="1" rowspan="1"
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243 | valign="top" align="left">
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244 |
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245 | Ant version 1.4.1 compiled on October 11 2001<br />
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246 | Buildfile: build.xml<br />
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247 | Detected Java version: 1.3 in: D:\usr\local\java\jdk13\jre<br />
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248 | Detected OS: Windows NT<br />
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249 | parsing buildfile D:\ant\build.xml
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250 | with URI = file:D:/ant/build.xml<br />
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251 | Project base dir set to: D:\ant<br />
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252 | [property] Loading Environment env.<br />
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253 | [property] Loading D:\ant\conf.properties<br />
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254 | Build sequence for target 'debug' is [debug]<br />
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255 | Complete build sequence is [debug, gensrc, compile, jar, test]<br />
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256 | . . .<br />
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257 |
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258 | </td>
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259 | </tr>
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260 | </table>
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261 | <p>
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262 | You should be able to see from the trace more about what Ant
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263 | is doing and why it's taking a particular course of action.
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264 | If you need even more information, you can use the
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265 | <code>-debug</code> flag rather than
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266 | <code>-verbose</code>.
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267 | This will generally produce so much
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268 | output that you may want to save the output to a file and
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269 | analyze it in an editor. You can save the output using the
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270 | <code>-logfile <filename></code> flag, or
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271 | using redirection.
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272 | </p>
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273 | <p>
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274 | Once you have all this debug information, how can you use it
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275 | to solve your problem? That will depend on the task in question
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276 | and the nature of your problem. Each task logs different aspects
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277 | of its operation, but it should give you an idea of what is going
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278 | on. For example, the <code><javac></code> task logs the
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279 | reasons why it
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280 | chooses to compile particular class files and not others, along
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281 | with which compiler it is using and the arguments it will pass
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282 | to that compiler. The following partial trace shows why
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283 | <code><javac></code> is adding one class file but
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284 | skipping another.
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285 | This is followed by which compiler it will be using, the
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286 | arguments that will get passed to the compiler,
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287 | and a list of all the class files to be compiled.
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288 | </p>
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289 | <table class="ForrestTable" cellspacing="1" cellpadding="4">
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290 | <tr>
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291 | <td colspan="1" rowspan="1"
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292 | valign="top" align="left">
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293 |
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294 | [javac] Test.java omitted as D:\classes\Test.class is up to date.<br />
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295 | [javac] Unset.java added as D:\classes\Unset.class is outdated.<br />
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296 | [javac] Compiling 1 source file to D:\classes<br />
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297 | [javac] Using classic compiler<br />
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298 | [javac] Compilation args: -d D:\classes -classpath D:\classes;<br />
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299 | D:\jdk118\classes.zip; -sourcepath D:\src\java -g:none<br />
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300 | [javac] File to be compiled:<br />
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301 | D:\src\java\Unset.java<br />
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302 |
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303 | </td>
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304 | </tr>
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305 | </table>
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306 | <p>
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307 | In many cases, Ant tasks are wrappers around OS commands or
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308 | other Java classes. In debug mode, many of these tasks will
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309 | print out the equivalent command line, as the
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310 | <code><javac></code> task
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311 | output does. If you are having a problem, it is often useful to
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312 | run the command directly from the command line, in the same way
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313 | Ant is running it, and see if the problem occurs from there
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314 | as well. The problem may be in the command that is being run,
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315 | or it may be in the way the Ant task is running the command.
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316 | You can also see the effect of changing attribute values on the
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317 | generated command line. This can help you to understand whether
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318 | you are using the correct attributes and values.
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319 | </p>
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320 | <h4 class="subsection">
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321 | <a name="Has It Been Fixed?"></a>
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322 | Has It Been Fixed?
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323 | </h4>
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324 | <p>
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325 | After examining the debug output, if you still believe that the
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326 | problem you are having is caused by Ant, chances are that someone
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327 | else may have already encountered this problem, and perhaps it has
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328 | been fixed. The next step, therefore, may be to try a nightly build
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329 | of Ant to see if the problem has been fixed. <!--Nightly builds for Ant
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330 | are available from the
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331 | <a href="http://brutus.apache.org/~nightlybuild/builds/ant/">
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332 | Ant web site</a>.--> While Ant nightly builds are typically quite
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333 | stable and are used by
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334 | <a href="http://brutus.apache.org/gump/public/">Gump</a>
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335 | to build many other Jakarta projects, these builds should
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336 | nonetheless be treated as experimental. Note that nightly builds
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337 | do not build many of the optional tasks the come with Ant.
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338 | A snapshot of these optional tasks is occasionally uploaded to
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339 | the nightly download
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340 | <a href="http://cvs.apache.org/builds/ant/nightly/optional/">
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341 | area</a>. However, even this snapshot does not contain every
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342 | optional task.
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343 | </p>
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344 | <h4 class="subsection">
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345 | <a name="Has It Been Reported?"></a>
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346 | Has It Been Reported?
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347 | </h4>
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348 | <p>
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349 | If the current nightly build doesn't resolve your problem, it is
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350 | possible that someone else has reported the issue. It is time to
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351 | look at the <a href="http://issues.apache.org/bugzilla/">
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352 | Apache Bug Database</a>. This system is easy to use, and it will
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353 | let you search the <a href="http://issues.apache.org/bugzilla/buglist.cgi?bug_status=UNCONFIRMED&bug_status=NEW&bug_status=ASSIGNED&bug_status=REOPENED&email1=&emailtype1=substring&emailassigned_to1=1&email2=&emailtype2=substring&emailreporter2=1&bugidtype=include&bug_id=&changedin=&votes=&chfieldfrom=&chfieldto=Now&chfieldvalue=&product=Ant&short_desc=&short_desc_type=substring&long_desc=&long_desc_type=substring&bug_file_loc=&bug_file_loc_type=substring&keywords=&keywords_type=anywords&field0-0-0=noop&type0-0-0=noop&value0-0-0=&order=bugs.bug_id">
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354 | currently open</a> and resolved bugs to see if your problem has
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355 | already been reported. If your problem has been reported, you can
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356 | see whether any of the developers have commented, suggesting
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357 | workarounds, or the reason for the bug, etc. Or you may have
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358 | information to add (see about creating and modifying bug reports
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359 | below), in which case, go right ahead and add the information.
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360 | If you don't have any additional information, you may just want
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361 | to vote for this bug, and perhaps
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362 | add yourself to the <code>CC</code> list to follow the progress
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363 | of this bug.
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364 | </p>
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365 | <h4 class="subsection">
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366 | <a name="Filing a Bug Report"></a>
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367 | Filing a Bug Report
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368 | </h4>
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369 | <p>
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370 | By this time, you may have decided that there is an unreported
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371 | bug in Ant. You have a few choices at this point. You can send
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372 | an email to the <code>user</code> mailing list
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373 | to see if
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374 | others have encountered your issue and find out how they may
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375 | have worked around it. If after some discussion, you feel it
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376 | is time to create
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377 | a bug report, this is a simple operation in the bug database.
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378 | Please try to provide as much information as possible in order
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379 | to assist the developers in resolving the bug. Please try to enter
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380 | correct values for the various inputs when creating the bug, such
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381 | as which version of Ant you are running, and on which platform,
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382 | etc. Once the bug is created, you can also add attachments to
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383 | the bug report.
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384 | </p>
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385 | <p>
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386 | What information should you include in your bug report? The
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387 | easiest bugs to fix are those that are most easily reproducible,
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388 | so it is really helpful if you can produce a small test case that
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389 | exhibits the problem. In this case, you would attach the build file
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390 | and any other files necessary to reproduce the problem, probably
|
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391 | packed together in an archive. If you can't produce a test case,
|
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392 | you should try to include a snippet from your build file and the
|
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393 | relevant sections from the verbose or debug output from Ant. Try
|
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394 | to include the header information where Ant states the version,
|
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395 | the OS and VM information, etc. As debug output is likely to be
|
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396 | very large, it's best to remove any output that is not
|
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397 | relevant. Once the bug is entered into the bug database, you
|
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398 | will be kept informed by email about progress on the bug. If
|
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399 | you receive email asking for further information, please try to
|
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400 | respond, as it will aid in the resolution of your bug.
|
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401 | </p>
|
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402 | <h4 class="subsection">
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403 | <a name="Asking for an Enhancement"></a>
|
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404 | Asking for an Enhancement
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405 | </h4>
|
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406 | <p>
|
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407 | Sometimes, you may find that Ant just doesn't do what you need it
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408 | to. It isn't a bug, as such, since Ant is working the way it is
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409 | supposed to work. Perhaps it is some additional functionality for
|
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410 | a task that hasn't been thought of yet, or maybe a completely new
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411 | task. For these situations, you will
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412 | want to raise an <i>enhancement request</i>. Enhancement requests
|
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413 | are managed using the same Apache Bug Database described above.
|
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414 | These are just a different type of bug report. If you look in the
|
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415 | bug database, you will see that one of the severity settings for
|
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416 | a bug is "Enhancement". Just fill the bug report in,
|
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417 | set the severity of the bug to "Enhancement", and
|
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418 | state in the description how you would like to have Ant enhanced.
|
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419 | Again, you should first check whether there are any existing
|
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420 | enhancment requests that cover your needs. If so, just add your
|
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421 | vote to these.
|
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422 | </p>
|
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423 | <h4 class="subsection">
|
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424 | <a name="Fixing the Bug"></a>
|
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425 | Fixing the Bug
|
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426 | </h4>
|
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427 | <p>
|
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428 | If you aren't satisfied with just filing a bug report, you can
|
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429 | try to find the cause of the problem and provide a fix yourself.
|
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430 | The best way to do that is by working with the latest code from CVS.
|
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431 | Alternatively, you can work with the source code available from the
|
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432 | <a href="http://ant.apache.org/srcdownload.cgi">
|
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433 | source distributions</a>. If you
|
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434 | are going to tackle the problem at this level, you may want to
|
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435 | discuss some details first on the <code>dev</code>
|
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436 | mailing list. Once you have a fix for the problem, you may submit
|
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437 | the fix as a <i>patch</i> to either the
|
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438 | <code>dev</code> mailing
|
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439 | list, or enter the bug database as described above and attach the
|
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440 | patch to the bug report. Using the bug database has the advantage
|
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441 | of being able to track the progress of your patch.
|
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442 | </p>
|
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443 | <p>
|
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444 | If you have a patch to submit and are sending it to the
|
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445 | <code>dev</code> mailing list,
|
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446 | prefix "[PATCH]"
|
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447 | to your message subject. Please include any relevant bug numbers.
|
---|
448 | Patch files should be created with the <code>-u</code>
|
---|
449 | option of the
|
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450 | <code>diff</code> or <code>cvs diff</code> command. For
|
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451 | example:<br /><br />
|
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452 | <font face="verdana" size="-1">
|
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453 | diff -u Javac.java.orig Javac.java > javac.diffs<br /><br />
|
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454 | </font>
|
---|
455 | or, if you have source from CVS:<br /><br />
|
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456 | <font face="verdana" size="-1">
|
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457 | cvs diff -u Javac.java > javac.diffs<br /><br />
|
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458 | </font>
|
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459 |
|
---|
460 | Note: You should give your patch files meaningful names.
|
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461 | This makes it easier for developers who need to apply a number
|
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462 | of different patch files.
|
---|
463 | </p>
|
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464 |
|
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465 | </div>
|
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466 | </div>
|
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467 |
|
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468 | <p class="copyright">
|
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469 | Copyright © 2000-2005 The Apache Software Foundation. All rights reserved.
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470 | <script type="text/javascript" language="JavaScript"><!--
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471 | document.write(" - "+"Last Published: " + document.lastModified);
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472 | // -->
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473 | </script>
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474 | </p>
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475 | </body>
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476 | </html>
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477 |
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478 |
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479 |
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481 |
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