在Spring Boot應用程序中找不到紅寶石寶石

Question

我創建了一個jar文件，其中包含一個由Spring服務包裝的Ruby gem（activemerchant），該服務使用JRuby ScriptContainer調用一個利用ruby gem的小型Ruby腳本。 這個罐子的單元測試對Ruby寶石都可以正常工作-寶石被拾起並按預期運行。

該罐包含以下文件夾：

com
    ... <not relevant> ...
gateways
    ... <not relevant> ...
gems
    activemerchant-1.75.0
    activesupport-5.2.0.beta2
    builder-3.2.3
    concurrent-ruby-1.0.5-java
    i18n-0.9.1
    minitest-5.11.1
    nokogiri-1.8.1-java
    thread_safe-0.3.6-java
    tzinfo-1.2.4
META-INF
    MANIFEST.MF
scripts
    main.rb
specifications
    activemerchant-1.75.0.gemspec
    activesupport-5.2.0.beta2.gemspec
    builder-3.2.3.gemspec
    concurrent-ruby-1.0.5-java.gemspec
    i18n-0.9.1.gemspec
    minitest-5.11.1.gemspec
    nokogiri-1.8.1-java.gemspec
    thread_safe-0.3.6-java.gemspec
    tzinfo-1.2.4.gemspec

該jar嵌入到使用嵌入式Tomcat容器的Spring Boot應用程序中。 在啟動Spring Boot應用程序時，出現錯誤：

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'activeMerchantGatewayProvider': Invocation of init method failed; nested exception is org.jruby.embed.EvalFailedException: (LoadError) no such file to load -- activemerchant
    at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:136)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:408)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1570)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:220)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:353)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:334)
    at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1088)
    at com.mydomain.financial.gateway.GatewayService.lambda$init$0(GatewayService.java:39)
    at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
    at java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948)
    at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
    at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
    at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
    at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
    at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
    at com.mydomain.financial.gateway.GatewayService.init(GatewayService.java:40)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:365)
    at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcessor.java:310)
    at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:133)
    ... 81 common frames omitted
Caused by: org.jruby.embed.EvalFailedException: (LoadError) no such file to load -- activemerchant
    at org.jruby.embed.internal.EmbedEvalUnitImpl.run(EmbedEvalUnitImpl.java:131)
    at org.jruby.embed.ScriptingContainer.runUnit(ScriptingContainer.java:1307)
    at org.jruby.embed.ScriptingContainer.runScriptlet(ScriptingContainer.java:1352)
    at com.mydomain.financial.gateway.activemerchant.ActiveMerchantGatewayProvider.init(ActiveMerchantGatewayProvider.java:36)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:365)
    at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcessor.java:310)
    at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:133)
    ... 108 common frames omitted
Caused by: org.jruby.exceptions.RaiseException: (LoadError) no such file to load -- activemerchant
    at org.jruby.RubyKernel.require(org/jruby/RubyKernel.java:955)
    at uri_3a_classloader_3a_.META_minus_INF.jruby_dot_home.lib.ruby.stdlib.rubygems.core_ext.kernel_require.require(uri:classloader:/META-INF/jruby.home/lib/ruby/stdlib/rubygems/core_ext/kernel_require.rb:55)
    at RUBY.<main>(classpath:/scripts/main.rb:2)

如何獲得Spring Boot嵌入式Tomcat / JRuby來識別嵌入式jar中的寶石？

Answer 1

真是皮塔餅。 我找到了解決方法，但是花了點功夫。

失敗的原因是JRuby無法掃描內部jar文件中的gem。 似乎這是Java的問題，而不是JRuby的問題。 我也無法找到一種方法來掃描jar中的jar目錄，盡管我可以從jar中的jar中獲取文件。 我的解決方案是在構建內部jar時創建一個寶石列表，並在Spring Boot應用程序啟動期間檢索該列表文件。

特別：

在內部jar中，我如下更改了ScriptContainer邏輯（GEMS_PATH = / gems）：

@PostConstruct
private void init() {
    ScriptingContainer scriptingContainer = new ScriptingContainer(LocalContextScope.CONCURRENT);

    // Locate load paths and add them to the container. This doesn't work in JRuby as expected
    // once this jar is embedded into a Spring Boot uber project, so I need to do it explicitly
    // here.
    List<String> loadPaths = scriptingContainer.getLoadPaths();
    URL resource = getClass().getResource(GEMS_PATH + "/gems.list");
    if (resource == null) {
        throw new RuntimeException("Unable to find " + GEMS_PATH + "/gems.list");
    }

    try {
        log.debug("ActiveMerchant gems root: {}", resource);
        String content = IOUtils.toString(resource, "UTF-8");
        if (StringUtils.isEmpty(content)) {
            throw new RuntimeException(GEMS_PATH + "/gems.list is empty");
        }

        Stream.of(content.split(";")).forEach(gem -> {
            String gemDir = "uri:classloader:" + GEMS_PATH + "/" + gem + "/lib";
            if (!loadPaths.contains(gemDir)) {
                loadPaths.add(gemDir);
                log.debug("ActiveMerchant added gem entry to load paths: {}", gemDir);
            }
        });
    } catch (IOException e) {
        throw new RuntimeException(e);
    }

如您所見，這是內部jar中Spring管理的組件的一部分。

在pom.xml中，我添加了此插件：

<plugin>
    <artifactId>maven-antrun-plugin</artifactId>
    <version>1.8</version>
    <executions>
        <execution>
            <phase>prepare-package</phase>
            <configuration>
                <target>
                    <dirset id="gems-dir" dir="${project.build.outputDirectory}/gems" includes="*"/>
                    <property name="gem-dirs" refid="gems-dir"/>
                    <echo file="${project.build.outputDirectory}/gems/gems.list">${gem-dirs}</echo>
                </target>
            </configuration>
            <goals>
                <goal>run</goal>
            </goals>
        </execution>
    </executions>
</plugin>

這將在內部jar中創建文件/gems/gems.list，其中包含打包到jar中的所有寶石。 當Spring Boot初始化組件時，它會找到gems.list並使用它來構建加載路徑列表。