在 Xtext 版本 2.17.0 上以编程方式生成 Xtext 项目会产生错误

Question

我正在使用 Xtext 版本 2.17.0 (Java 11) 以编程方式生成 Xtext 项目。整个过程是：

1. 在我自己的 maven 项目中，我以编程方式生成这些 Xtext 项目。
2. 生成项目后，我将语法写入运行时项目并在父 Xtext 项目上运行 mvn compile，以生成语法工件（例如通过在 Eclipse IDE 中运行 Wme2 工作流）。
3. 我将 org.eclipse.ui.console;bundle-version="3.8.100" 添加到 ui 项目的清单中。然后还有一个 jar 到 Bundle-ClassPath，所以最终 Manifest 是这样的：

Bundle-ManifestVersion: 2
Bundle-Name: org.mealy.ui
Bundle-Vendor: My Company
Bundle-Version: 1.0.0.qualifier
Bundle-SymbolicName: org.mealy.ui; singleton:=true
Bundle-ActivationPolicy: lazy
Require-Bundle: org.mealy,org.mealy.ide,org.eclipse.xtext.ui,org.eclipse
 .xtext.ui.shared,org.eclipse.xtext.ui.codetemplates.ui,org.eclipse.ui.e
 ditors;bundle-version="3.5.0",org.eclipse.ui.ide;bundle-version="3.5.0"
 ,org.eclipse.ui,org.eclipse.compare,org.eclipse.xtext.builder,org.eclip
 se.xtext.xbase.lib;bundle-version="2.14.0",org.eclipse.xtend.lib;bundle
 -version="2.14.0";resolution:=optional,org.eclipse.ui.console;bundle-ve
 rsion="3.8.100"
Import-Package: org.apache.log4j
Bundle-RequiredExecutionEnvironment: JavaSE-11
Automatic-Module-Name: org.mealy.ui
Export-Package: org.mealy.ui.internal,org.mealy.ui.quickfix,org.mealy.ui
 .contentassist
Bundle-Activator: org.mealy.ui.internal.MealyActivator
Bundle-ClassPath: lib/mealyMachine-1.0-SNAPSHOT.jar,
 .

4. 之后我会生成一些源代码文件等。
5. 然后我在父 Xtext 项目上手动运行 mvn 包，以便构建所有项目并获取代表 Eclipse 插件和语言服务器的 jar。

但是在 Xtext 的 2.17.0 版本（使用 Java 11）上运行最后一点时，会将某些内容添加到 ui Xtext 项目的 MANIFEST.MF 中，并且 mvn 包失败并出现以下错误：

[ERROR] Failed to execute goal org.eclipse.tycho:tycho-p2-plugin:1.3.0:p2-metadata-default (default-p2-metadata-default) on project org.mealy.ui: Execution default-p2-metadata-default of goal org.eclipse.tycho:tycho-p2-plugin:1.3.0:p2-metadata-default failed. IllegalArgumentException -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.eclipse.tycho:tycho-p2-plugin:1.3.0:p2-metadata-default (default-p2-metadata-default) on project org.mealy.ui: Execution default-p2-metadata-default of goal org.eclipse.tycho:tycho-p2-plugin:1.3.0:p2-metadata-default failed.
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:212)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)
    at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)
    at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863)
    at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288)
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:199)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
    at org.codehaus.classworlds.Launcher.main(Launcher.java:47)
Caused by: org.apache.maven.plugin.PluginExecutionException: Execution default-p2-metadata-default of goal org.eclipse.tycho:tycho-p2-plugin:1.3.0:p2-metadata-default failed.
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:145)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207)
    ... 21 more
Caused by: java.lang.IllegalArgumentException
    at org.eclipse.tycho.p2.impl.publisher.P2GeneratorImpl.getCanonicalArtifact(P2GeneratorImpl.java:206)
    at org.eclipse.tycho.p2.impl.publisher.P2GeneratorImpl.generateMetadata(P2GeneratorImpl.java:148)
    at org.eclipse.tycho.plugins.p2.P2MetadataMojo.attachP2Metadata(P2MetadataMojo.java:157)
    at org.eclipse.tycho.plugins.p2.P2MetadataMojo.execute(P2MetadataMojo.java:116)
    at org.eclipse.tycho.plugins.p2.P2MetadataDefaultMojo.execute(P2MetadataDefaultMojo.java:33)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
    ... 22 more

UI Xtext 项目的 Manifest.mf 最后看起来是这样的：

Bundle-ManifestVersion: 2
Bundle-Name: org.mealy.ui
Bundle-Vendor: My Company
Bundle-Version: 1.0.0.qualifier
Bundle-SymbolicName: org.mealy.ui; singleton:=true
Bundle-ActivationPolicy: lazy
Require-Bundle: org.mealy,org.mealy.ide,org.eclipse.xtext.ui,org.eclipse
 .xtext.ui.shared,org.eclipse.xtext.ui.codetemplates.ui,org.eclipse.ui.e
 ditors;bundle-version="3.5.0",org.eclipse.ui.ide;bundle-version="3.5.0"
 ,org.eclipse.ui,org.eclipse.compare,org.eclipse.xtext.builder,org.eclip
 se.xtext.xbase.lib;bundle-version="2.14.0",org.eclipse.xtend.lib;bundle-version="2.14.0";bundle
 -version="2.14.0";resolution:=optional,org.eclipse.ui.console;bundle-ve
 rsion="3.8.100",
 org.eclipse.ui.editors,
 org.eclipse.xtext.xbase.lib;bundle-version="2.14.0",
 org.eclipse.xtext.ui.shared
Import-Package: org.apache.log4j
Bundle-RequiredExecutionEnvironment: JavaSE-11
Automatic-Module-Name: org.mealy.ui
Export-Package: org.mealy.ui.internal,org.mealy.ui.quickfix,org.mealy.ui
 .contentassist,
 org.mealy.ui.contentassist
Bundle-Activator: org.mealy.ui.internal.MealyActivator
Bundle-ClassPath: lib/mealyMachine-1.0-SNAPSHOT.jar,
 .

使用 Xtext 2.16.0 和 Java 8 运行相同的代码不会产生此类错误，并且在运行列表中的第 5 点时不会向清单中写入任何内容。

可能是什么问题？

Answer 1

看起来您确实遇到了一个错误。作为一种解决方法，您可以尝试禁用清单合并

            eclipsePlugin = {
                enabled = true
                manifest = {
                    merge = false
                }
            }