GWT代码服务器在使用Maven原型生成的新项目中找不到模块

Question

GWT代码服务器在使用Maven原型生成的新项目中找不到模块

3

我已经使用GWT和Eclipse一段时间了，想尝试一下使用maven和GWT插件（gwt-maven-plugin, enter link description here）。我尝试在Eclipse之外的环境中使用它（Luna 4.4），但显然我没有正确地使用它，因为当我在pom.xml中更改一些小东西时，IDE会覆盖它的设置，导致它变得异常脆弱，经常出错。因此，我决定退一步，消除Eclipse的黑魔法，并从命令行开始一个新项目。

然而，我似乎无法运行实际应用程序，因为当我执行代码服务器并导航到页面时，我看到以下消息：

Can't find any GWT Modules on this page.

显然，代码服务器正在运行，但模块文件似乎没有被托管。据我所知，在自学几个小时后（并找到http://blog.ltgt.net/how-does-gwts-super-dev-mode-work/），应该有第二个进程实际上与代码服务器并行托管代码。使用maven做到这一点的适当方法是什么？我应该打开第二个终端并在代码服务器并行运行jetty或其他东西吗？如果是这样，能否有人请给我一个提示，如何最有效地完成它？

提前感谢！

以下是我创建项目的方式：

mvn archetype:generate \
   -DarchetypeGroupId=org.codehaus.mojo \
   -DarchetypeArtifactId=gwt-maven-plugin \
   -DarchetypeVersion=2.7.0
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building Maven Stub Project (No POM) 1
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] >>> maven-archetype-plugin:2.2:generate (default-cli) > generate-sources @ standalone-pom >>>
[INFO]
[INFO] <<< maven-archetype-plugin:2.2:generate (default-cli) < generate-sources @ standalone-pom <<<
[INFO]
[INFO] --- maven-archetype-plugin:2.2:generate (default-cli) @ standalone-pom ---
[INFO] Generating project in Interactive mode
[INFO] Archetype repository missing. Using the one from [org.codehaus.mojo:gwt-maven-plugin:2.7.0] found in catalog remote
Define value for property 'groupId': : com.mytest
Define value for property 'artifactId': : gwtmvntest
Define value for property 'version':  1.0-SNAPSHOT: :
Define value for property 'package':  com.mytest: : com.mytest.gwtmvntest
Define value for property 'module': : GwtMvnTest
Confirm properties configuration:
groupId: com.mytest
artifactId: gwtmvntest
version: 1.0-SNAPSHOT
package: com.mytest.gwtmvntest
module: GwtMvnTest
 Y: :
[INFO] ----------------------------------------------------------------------------
[INFO] Using following parameters for creating project from Archetype: gwt-maven-plugin:2.7.0
[INFO] ----------------------------------------------------------------------------
[INFO] Parameter: groupId, Value: com.mytest
[INFO] Parameter: artifactId, Value: gwtmvntest
[INFO] Parameter: version, Value: 1.0-SNAPSHOT
[INFO] Parameter: package, Value: com.mytest.gwtmvntest
[INFO] Parameter: packageInPathFormat, Value: com/mytest/gwtmvntest
[INFO] Parameter: package, Value: com.mytest.gwtmvntest
[INFO] Parameter: version, Value: 1.0-SNAPSHOT
[INFO] Parameter: module, Value: GwtMvnTest
[INFO] Parameter: groupId, Value: com.mytest
[INFO] Parameter: artifactId, Value: gwtmvntest
[INFO] project created from Archetype in dir: /private/tmp/mvn/gwtmvntest
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 08:12 min
[INFO] Finished at: 2015-01-14T12:59:17+01:00
[INFO] Final Memory: 15M/310M
[INFO] ------------------------------------------------------------------------

这是我编译项目的步骤：

mvn compile gwt:compile
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building GWT Maven Archetype 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- gwt-maven-plugin:2.7.0:generateAsync (default) @ gwtmvntest ---
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ gwtmvntest ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 2 resources
[INFO]
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ gwtmvntest ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 6 source files to /private/tmp/mvn/gwtmvntest/target/gwtmvntest-1.0-SNAPSHOT/WEB-INF/classes
[INFO]
[INFO] --- gwt-maven-plugin:2.7.0:compile (default-cli) @ gwtmvntest ---
[INFO] Compiling module com.mytest.gwtmvntest.GwtMvnTest
[INFO]    Compiling 5 permutations
[INFO]       Compiling permutation 0...
[INFO]       Process output
[INFO]          Compiling
[INFO]             Compiling permutation 4...
[INFO]       Process output
[INFO]          Compiling
[INFO]             Compiling permutation 3...
[INFO]       Process output
[INFO]          Compiling
[INFO]             Compiling permutation 2...
[INFO]       Process output
[INFO]          Compiling
[INFO]             Compiling permutation 1...
[INFO]    Compile of permutations succeeded
[INFO]    Compilation succeeded -- 13.866s
[INFO] Linking into /private/tmp/mvn/gwtmvntest/target/gwtmvntest-1.0-SNAPSHOT/GwtMvnTest
[INFO]    Link succeeded
[INFO]    Linking succeeded -- 0.171s
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 18.228 s
[INFO] Finished at: 2015-01-14T13:07:07+01:00
[INFO] Final Memory: 22M/310M
[INFO] ------------------------------------------------------------------------

这是我运行项目的方法：

mvn gwt:run-codeserver
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building GWT Maven Archetype 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] >>> gwt-maven-plugin:2.7.0:run-codeserver (default-cli) > process-classes @ gwtmvntest >>>
[INFO]
[INFO] --- gwt-maven-plugin:2.7.0:generateAsync (default) @ gwtmvntest ---
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ gwtmvntest ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 2 resources
[INFO]
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ gwtmvntest ---
[INFO] Nothing to compile - all classes are up to date
[INFO]
[INFO] <<< gwt-maven-plugin:2.7.0:run-codeserver (default-cli) < process-classes @ gwtmvntest <<<
[INFO]
[INFO] --- gwt-maven-plugin:2.7.0:run-codeserver (default-cli) @ gwtmvntest ---
[INFO] Turning off precompile in incremental mode.
[INFO] Super Dev Mode starting up
[INFO]    workDir: /var/folders/nk/58gyq85x7l3_mzb5rc0gw42w0000gn/T/gwt-codeserver-5859907708379954718.tmp
[INFO]    Loading Java files in com.mytest.gwtmvntest.GwtMvnTest.
[INFO]    Module setup completed in 11742 ms
[ERROR] 2015-01-14 13:14:35.800:INFO:oejs.Server:jetty-8.y.z-SNAPSHOT
[ERROR] 2015-01-14 13:14:35.833:INFO:oejs.AbstractConnector:Started SelectChannelConnector@127.0.0.1:9876
[INFO]
[INFO] The code server is ready at http://localhost:9876/

- el.nicko

你仍然需要部署你的应用程序。GWT代码服务器允许您根据需要重新编译GWT代码（它替换所有JS代码，如果我没记错的话），但基本应用程序本身也需要运行。换句话说，按照通常的方式部署测试环境，然后启动代码服务器。 - Compass

感谢您的评论。有没有办法在Maven中做到这一点？我尝试在另一个窗口中运行“mvn tomcat7:run”。它会在http://localhost:8080/上提供HTML页面，但还是会显示“在此页面上找不到任何GWT模块”的消息。 - el.nicko

我检查了Tomcat提供的HTML。它引用了GwtMvnTest/GwtMvnTest.nocache.js，因此它试图在http://localhost:8080/下找到它，但实际上它并不存在那里。它实际上是由Code Server在http://localhost:9876/下提供的。有什么想法吗？ - el.nicko

在运行Dev Mode On书签之前，http://localhost:8080/无法从http://localhost:9876/加载脚本。尽管如此，自GWT 2.7以来，事情变得更加容易；请参见下面的答案。 - Thomas Broyer

1个回答

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原文链接

- Thomas Broyer · Accepted Answer

使用GWT2.7+，您只需要启动mvn gwt:run，它将在后台使用SuperDevMode，并进行“重新编译加载”（而不是使用书签）。请注意，gwt:run不会复制您的src/main/webapp或依赖项，因此您可能需要先运行mvn war:exploded（或mvn package）（每次更改src/main/webapp中的文件或需要刷新依赖项时都要这样做）。

话虽如此，除非您的项目非常简单，否则您应该尽早为客户端和服务器端代码使用不同的Maven模块；这是因为Maven坚持认为您不能在同一个POM中管理“GWT客户端类路径”和“服务器端类路径”。我发布了原型来帮助设置所有内容：https://github.com/tbroyer/gwt-maven-archetypes（不幸的是，我还没有时间将它们更新到GWT 2.7）。或者使用Gradle...