在 DefaultCamelContext.start() 上引起的 StackOverflowException，似乎是由骆驼进入无限循环引起的答案

【问题标题】：StackOverflowException caused on DefaultCamelContext.start(), appears to be caused by camel goint into an infinite loop在 DefaultCamelContext.start() 上引起的 StackOverflowException，似乎是由骆驼进入无限循环引起的
【发布时间】：2012-10-01 17:26:27
【问题描述】：

我已对此进行了搜索，但尚未找到有关此问题的问题。我正在创建一个骆驼路线，它监视 shapefile (.shp) 的文件夹。下面的代码是实现骆驼路线的代码。

final String filePath = settings.getSetting(GMTI_VOCAB.SHAPEFILE_PATH);
logger.debug("filePath={}", filePath);
final File file = new File(filePath);
if (file.mkdir())
{
  logger.warn("Shapefile path did not exist. Creating directory.");
}

logger.debug("Creating file route.");
context.addRoutes(new RouteBuilder()
{

    @Override
    public void configure() throws Exception
    {
        String path = String.format("file://%s?noop=true&include=.*shp$", file.getAbsolutePath());
        logger.debug("Route is: {}", path);
        from(path).bean(this, "process(${file:path})");
    }
 });
 logger.debug("Starting context");
 context.start();
 logger.info("Communicator started!");

当前返回的文件路径只是“shapefile”，导致 file.getAbsolutePath() 返回“C:\Users\medderssc\gmti_intestor\shapefiles”。返回的结果路径是

from("file://C:\Users\medderssc\gmti_intestor\shapefiles?noop=true&include=.*shp$").bean(this, "process(${file:path})");

context 是一个 DefaultCamelContext，camel 是通过 maven 导入的，在 POM 中有以下条目：

    <dependency>
        <groupId>org.apache.camel</groupId>
        <artifactId>camel-core</artifactId>
        <version>2.10.0</version>
    </dependency>

"Communicator started" 永远不会输出，程序在此之前崩溃，告诉我在 context.start() 期间发生错误。下面的堆栈跟踪显示了 StackOverflowException。请注意堆栈本身重复了几次，这意味着骆驼本身正在以某种方式进入某种无限递归循环。除了发布的代码之外，没有进一步的骆驼配置。任何人都可以帮忙吗？下面的异常堆栈：

2012 年 10 月 1 日上午 9:33:50 com.saic.ogc.client.BaseClient createMessageFactory 信息：默认为内置消息工厂... 2012 年 10 月 1 日上午 9:33:50 com.saic.ogc.client.BaseClient initTemplate 信息：设置拦截器！线程“主”java.lang.StackOverflowError 中的异常

at org.apache.camel.model.RouteDefinition.toString(RouteDefinition.java:119)
at java.lang.String.valueOf(Unknown Source)
at java.lang.StringBuilder.append(Unknown Source)
at java.util.AbstractCollection.toString(Unknown Source)
at java.lang.String.valueOf(Unknown Source)
at java.lang.StringBuilder.append(Unknown Source)
at org.apache.camel.model.RoutesDefinition.toString(RoutesDefinition.java:60)
at org.apache.camel.builder.RouteBuilder.toString(RouteBuilder.java:58)
at org.apache.camel.model.BeanDefinition.description(BeanDefinition.java:81)
at org.apache.camel.model.BeanDefinition.toString(BeanDefinition.java:70)
at java.lang.String.valueOf(Unknown Source)
at java.lang.StringBuilder.append(Unknown Source)
at java.util.AbstractCollection.toString(Unknown Source)
at java.lang.String.valueOf(Unknown Source)
at java.lang.StringBuilder.append(Unknown Source)
at org.apache.camel.model.RouteDefinition.toString(RouteDefinition.java:119)
at java.lang.String.valueOf(Unknown Source)
at java.lang.StringBuilder.append(Unknown Source)
at java.util.AbstractCollection.toString(Unknown Source)
at java.lang.String.valueOf(Unknown Source)
at java.lang.StringBuilder.append(Unknown Source)
at org.apache.camel.model.RoutesDefinition.toString(RoutesDefinition.java:60)
at org.apache.camel.builder.RouteBuilder.toString(RouteBuilder.java:58)
at org.apache.camel.model.BeanDefinition.description(BeanDefinition.java:81)
at org.apache.camel.model.BeanDefinition.toString(BeanDefinition.java:70)
at java.lang.String.valueOf(Unknown Source)
at java.lang.StringBuilder.append(Unknown Source)
at java.util.AbstractCollection.toString(Unknown Source)
at java.lang.String.valueOf(Unknown Source)
at java.lang.StringBuilder.append(Unknown Source)
at org.apache.camel.model.RouteDefinition.toString(RouteDefinition.java:119)
at java.lang.String.valueOf(Unknown Source)
at java.lang.StringBuilder.append(Unknown Source)
at java.util.AbstractCollection.toString(Unknown Source)
at java.lang.String.valueOf(Unknown Source)
at java.lang.StringBuilder.append(Unknown Source)
at org.apache.camel.model.RoutesDefinition.toString(RoutesDefinition.java:60)
at org.apache.camel.builder.RouteBuilder.toString(RouteBuilder.java:58)
at org.apache.camel.model.BeanDefinition.description(BeanDefinition.java:81)
at org.apache.camel.model.BeanDefinition.toString(BeanDefinition.java:70)
at java.lang.String.valueOf(Unknown Source)
at java.lang.StringBuilder.append(Unknown Source)
at java.util.AbstractCollection.toString(Unknown Source)
at java.lang.String.valueOf(Unknown Source)
at java.lang.StringBuilder.append(Unknown Source)
at org.apache.camel.model.RouteDefinition.toString(RouteDefinition.java:119)
at java.lang.String.valueOf(Unknown Source)
at java.lang.StringBuilder.append(Unknown Source)
at java.util.AbstractCollection.toString(Unknown Source)
at java.lang.String.valueOf(Unknown Source)
at java.lang.StringBuilder.append(Unknown Source)
at org.apache.camel.model.RoutesDefinition.toString(RoutesDefinition.java:60)
at org.apache.camel.builder.RouteBuilder.toString(RouteBuilder.java:58)
at org.apache.camel.model.BeanDefinition.description(BeanDefinition.java:81)
at org.apache.camel.model.BeanDefinition.toString(BeanDefinition.java:70)
at java.lang.String.valueOf(Unknown Source)
at java.lang.StringBuilder.append(Unknown Source)
at java.util.AbstractCollection.toString(Unknown Source)
at java.lang.String.valueOf(Unknown Source)

【问题讨论】：

标签： apache-camel stack-overflow

【解决方案1】：

乍一看，问题似乎是您的 .bean(this,...) 指的是匿名类 (new RouteBuilder()) 并将尝试运行 configure()（因此是递归/sfo）...尝试使用您的 bean/process() 方法的单独类...

【讨论】：

菜鸟错误。忘了看我的范围。意思是“this”指的是开始路线的对象。感谢您引起我的注意。创建了对预期对象的单独引用并将其传递给 .bean()，现在可以使用。谢谢。

【解决方案2】：

我遇到了类似的问题。我有一个实现处理器的 RouteBuilder（因为我很懒）。事实证明，这导致了无限递归。解决方法是将 process(...) 的实现移到它自己的类中。

【讨论】：