Question

我有两个使用Camel's Main的独立模块。它们都包含：

main.setPropertyPlaceholderLocations( "classpath:application.properties" );

我也尝试过：

main.setPropertyPlaceholderLocations( "application.properties" );

如果我从Eclipse中运行它们，两者都可以正常工作（已将<project>/target添加到 Run Configurations' Classpath ）。

如果我从cmd行运行它们：

...\target> java -jar <module>.jar

如果target同时包含application.properties和<module>.jar，则可以正常工作。另一个结果是：

Exception in thread "main" org.apache.camel.RuntimeCamelException: java.io.FileNotFoundException:
Properties file application.properties not found in classpath

我见过Q: Camel properties file not found in class path，但是我的application.properties 是在src/main/resources中，并在target期间复制到了mvn package。 / p>

更新1

为澄清。在项目的POM中，我使用：

    <resources>
        <resource>
            <directory>src/main/resources</directory>
            <excludes>
                <exclude>application.properties</exclude>
            </excludes>
        </resource>
        <resource>
            <directory>src/main/resources</directory>
            <includes>
                <include>application.properties</include>
            </includes>
            <targetPath>..</targetPath>  <!-- relative to target/classes -->
        </resource>
    <resources>

防止application.properties驻留在<module>.jar内部。

更新2

90   [main] INFO  <module>  - Starting Camel...
182  [main] INFO  org.apache.camel.impl.DefaultCamelContext  - Apache Camel 2.22.0 (CamelContext: camel-1) is shutting down
195  [main] INFO  org.apache.camel.impl.DefaultCamelContext  - Apache Camel 2.22.0 (CamelContext: camel-1) uptime
198  [main] INFO  org.apache.camel.impl.DefaultCamelContext  - Apache Camel 2.22.0 (CamelContext: camel-1) is shutdown in 0.017 seconds
Exception in thread "main" org.apache.camel.RuntimeCamelException: java.io.FileNotFoundException: Properties file application.properties not found in classpath
        at org.apache.camel.util.ObjectHelper.wrapRuntimeCamelException(ObjectHelper.java:1830)
        at org.apache.camel.model.RouteDefinitionHelper.initRouteInputs(RouteDefinitionHelper.java:382)
        at org.apache.camel.model.RouteDefinitionHelper.prepareRouteImp(RouteDefinitionHelper.java:298)
        at org.apache.camel.model.RouteDefinitionHelper.prepareRoute(RouteDefinitionHelper.java:270)
        at org.apache.camel.model.RoutesDefinition.route(RoutesDefinition.java:205)
        at org.apache.camel.model.RoutesDefinition.from(RoutesDefinition.java:158)
        at org.apache.camel.builder.RouteBuilder.from(RouteBuilder.java:169)
        at <module>Route.configure(<module>Route.java:24)
        at org.apache.camel.builder.RouteBuilder.checkInitialized(RouteBuilder.java:462)
        at org.apache.camel.builder.RouteBuilder.configureRoutes(RouteBuilder.java:402)
        at org.apache.camel.builder.RouteBuilder.addRoutesToCamelContext(RouteBuilder.java:383)
        at org.apache.camel.impl.DefaultCamelContext$1.call(DefaultCamelContext.java:1029)
        at org.apache.camel.impl.DefaultCamelContext$1.call(DefaultCamelContext.java:1026)
        at org.apache.camel.impl.DefaultCamelContext.doWithDefinedClassLoader(DefaultCamelContext.java:3272)
        at org.apache.camel.impl.DefaultCamelContext.addRoutes(DefaultCamelContext.java:1026)
        at org.apache.camel.main.MainSupport.postProcessCamelContext(MainSupport.java:612)
        at org.apache.camel.main.MainSupport.postProcessContext(MainSupport.java:550)
        at org.apache.camel.main.Main.doStart(Main.java:136)
        at org.apache.camel.support.ServiceSupport.start(ServiceSupport.java:61)
        at org.apache.camel.main.MainSupport.run(MainSupport.java:170)
        at <module>.run(<module>.java:44)
        at <module>.main(<module>.java:20)
Caused by: java.io.FileNotFoundException: Properties file application.properties not found in classpath
        at org.apache.camel.component.properties.DefaultPropertiesResolver.loadPropertiesFromClasspath(DefaultPropertiesResolver.java:112)
        at org.apache.camel.component.properties.DefaultPropertiesResolver.resolveProperties(DefaultPropertiesResolver.java:69)
        at org.apache.camel.component.properties.PropertiesComponent.parseUri(PropertiesComponent.java:207)
        at org.apache.camel.component.properties.PropertiesComponent.parseUri(PropertiesComponent.java:178)
        at org.apache.camel.impl.DefaultCamelContext.resolvePropertyPlaceholders(DefaultCamelContext.java:2552)
        at org.apache.camel.model.ProcessorDefinitionHelper.resolvePropertyPlaceholders(ProcessorDefinitionHelper.java:735)
        at org.apache.camel.model.RouteDefinitionHelper.initRouteInputs(RouteDefinitionHelper.java:380)
        ... 20 more
204  [Camel Thread #0 - CamelHangupInterceptor] INFO  org.apache.camel.main.MainSupport$HangupInterceptor  - Received hang up - stopping the main instance.

Answer 1

现在我知道为什么一个模块运行而另一个模块却没有运行。显然，骆驼在setPropertyPlaceholderLocations()之后执行了延迟加载，并且由于我还没有使用application.properties的任何属性（至今），它甚至都没有尝试读取文件。

现在，我正在使用它们，以前的工作模块也会失败。（错误导致真相的罕见情况之一；；）

解决方案是使用：

String jarPath = new File( 
    this.getClass().getProtectionDomain().getCodeSource().getLocation().toURI().getPath() )
    .getParent();
main.setPropertyPlaceholderLocations("file:" + jarPath + "/application.properties" )

几个小时前克劳斯（Claus）的评论，而不是：

main.setPropertyPlaceholderLocations("classpath:...")

在类路径中找不到属性文件application.properties

更新1

更新2

1 个答案: