Running jar inside target folder vs running jar inside project folder

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I have weird problem. When I’m running jar from project folder which goes:

java -jar ./target/project.jar

everything works fine, path is read correctly.

1107 [main] INFO org.apache.camel.core.xml.AbstractCamelContextFactoryBean - JMXAgent enabled: CamelJMXAgent[usePlatformMBeanServer=true, createConnector=true, registryPort=10098, serviceUrlPath=/, statisticsLevel=All, onlyRegisterProcessorWithCustomId=false, registerAlways=true, registerNewRoutes=true, mask=false]
2657 [main] INFO org.apache.camel.impl.converter.DefaultTypeConverter - Loaded 179 type converters
2853 [main] INFO org.apache.camel.spring.SpringCamelContext - Apache Camel 2.12.2 (CamelContext: data-feed-camel) is starting
2853 [main] INFO org.apache.camel.management.ManagedManagementStrategy - JMX is enabled
3078 [Camel Thread #1 - Camel Thread #0 - JMXConnector: service:jmx:rmi:///jndi/rmi://pjanik-pc:10098/] INFO org.apache.camel.management.DefaultManagementAgent - JMX Connector thread started and listening at: service:jmx:rmi:///jndi/rmi://pjanik-pc:10098/f

3089 [main] INFO org.apache.camel.spring.SpringCamelContext - StreamCaching is not in use. If using streams then its recommended to enable stream caching. See more details at http://camel.apache.org/stream-caching.html
3107 [main] INFO org.apache.camel.spring.SpringCamelContext - Total 0 routes, of which 0 is started.
3128 [main] INFO org.apache.camel.spring.SpringCamelContext - Apache Camel 2.12.2 (CamelContext: data-feed-camel) started in 0.255 seconds


org.apache.camel.component.file.FileEndpoint - Endpoint is configured with noop=true so forcing endpoint to be idempotent as well
    59471 [RMI TCP Connection(5)-10.88.55.167] INFO org.apache.camel.spring.SpringCamelContext - Route: flt_data_for_0543 started and consuming from: Endpoint[file://src/main/resources/view/flight/following/default/3648/flt_data?idempotentRepository=%23repo-flt_data_for_0543&noop=true&readLock=none]
    60552 [Camel (data-feed-camel) thread #4 -

but when I run jar inside target folder

1149 [main] INFO org.apache.camel.core.xml.AbstractCamelContextFactoryBean - JMXAgent enabled: CamelJMXAgent[usePlatformMBeanServer=true, createConnector=true, registryPort=10098, serviceUrlPath=/, statisticsLevel=All, onlyRegisterProcessorWithCustomId=false, registerAlways=true, registerNewRoutes=true, mask=false]
2688 [main] INFO org.apache.camel.impl.converter.DefaultTypeConverter - Loaded 179 type converters
2796 [main] INFO org.apache.camel.spring.SpringCamelContext - Apache Camel 2.12.2 (CamelContext: data-feed-camel) is starting
2796 [main] INFO org.apache.camel.management.ManagedManagementStrategy - JMX is enabled
2975 [Camel Thread #1 - Camel Thread #0 - JMXConnector: service:jmx:rmi:///jndi/rmi://pjanik-pc:10098/] INFO org.apache.camel.management.DefaultManagementAgent - JMX Connector thread started and listening at: service:jmx:rmi:///jndi/rmi://pjanik-pc:10098/
2981 [main] INFO org.apache.camel.spring.SpringCamelContext - StreamCaching is not in use. If using streams then its recommended to enable stream caching. See more details at http://camel.apache.org/stream-caching.html
2989 [main] INFO org.apache.camel.spring.SpringCamelContext - Total 0 routes, of which 0 is started.
2991 [main] INFO org.apache.camel.spring.SpringCamelContext - Apache Camel 2.12.2 (CamelContext: data-feed-camel) started in 0.194 seconds
21055 [RMI TCP Connection(4)-10.88.55.167] INFO org.apache.camel.component.file.FileEndpoint - Endpoint is configured with noop=true so forcing endpoint to be idempotent as well
21588 [RMI TCP Connection(4)-10.88.55.167] INFO org.apache.camel.spring.SpringCamelContext - Route: flt_data_for_0432 started and consuming from: Endpoint[file://src/main/resources/view/flight/following/default/3648/flt_data?idempotentRepository=%23repo-flt_data_for_0432&noop=true&readLock=none]

it stucks and nothing is doing further

The path is all the time the same:

private static final String DEFAULT_DATA_PATH = "view/flight/following/default/3648/";

What can be wrong? How can I avoid such a situation?

Answer

You Camel route consumes from endpoint file://src/main/resources/view/flight/following/default/3648/flt_data which is given as a relative path (in your project I guess). Therefore, it makes a difference when you execute your jar from target directory or not. This is because you are reading the file directly from the file system and not from your classpath.

In order to avoid this, there are (at least) 2 approaches:

  1. You consider the file as provided data consumed by your application: then pass the path to the file as an argument of your application and pass it to your route, the constants for file names you are currently using then become probably useless.

  2. You consider the file as a resource (i.e. sort of immutable data): then you can create an InputStream for your resource and read the bytes from it. In your case, you would write something like this:

     InputStream resourceStream = getClass().getResourceAsStream(DEFAULT_FLT_DATA_PATH);
     // Read bytes from resourceStream
    

See here for the documentation of getResourceAsStream.

If you have to use a Camel route, this answer suggests that you can use Camel’s Stream component (it also suggests the above approach using an InputStream, but in lesser detail). However, it does not mention how and I don’t know either. I would advice to ask for clarification on that answer.



Source: stackoverflow