Groovy's Ivy cache (@Grab) not caching?

groovy, groovy-grape

Solution

The files should be cached in `~/.groovy/grapes`. If you rerun your script with `-Divy.message.logger.level=4`, you'll get some debug information from ivy that may be helpful.

Additionally, if you have a grape that takes a long time to resolve, you can tell ivy to check less often. Copy the default ivy config from here to `~/.groovy/grapeConfig.xml` and add the property `ivy.cache.ttl.default` to some length of time to wait before checking again. For example:

<ivysettings>
  <property name="ivy.cache.ttl.default" value="24h"/>
  <settings defaultResolver="downloadGrapes"/>
  <resolvers>
    <chain name="downloadGrapes" returnFirst="true">
      <filesystem name="cachedGrapes">
        <ivy pattern="${user.home}/.groovy/grapes/[organisation]/[module]/ivy-[revision].xml"/>
        <artifact pattern="${user.home}/.groovy/grapes/[organisation]/[module]/[type]s/[artifact]-[revision](-[classifier]).[ext]"/>
      </filesystem>
      <ibiblio name="localm2" root="file:${user.home}/.m2/repository/" checkmodified="true" changingPattern=".*" changingMatcher="regexp" m2compatible="true"/>
      <!-- todo add 'endorsed groovy extensions' resolver here -->
      <ibiblio name="codehaus" root="http://repository.codehaus.org/" m2compatible="true"/>
      <ibiblio name="ibiblio" m2compatible="true"/>
      <ibiblio name="java.net2" root="http://download.java.net/maven/2/" m2compatible="true"/>
    </chain>
  </resolvers>
</ivysettings>

Problem

I'm running this simply groovy script using groovyConsole (version 1.8.1): ``` println "Start " + new Date() @Grab( 'log4j:log4j:1.2.16' ) import org.apache.log4j.Logger println "End " + new Date() ``` Usually, it executes very quickly (~ 0 seconds). However, sometimes (once every ~5 runs), it pauses for 3-5 seconds before completing the run. I'm sniffing with Wireshark (here is the capture), and see HTTP requests to `repository.codehaus.org` (I see some 404 responses in the Wireshark stream, but the script manages to run, so evidently the jars are found at some point) My question is - once the script runs once, aren't the jars it download via @Grab cached forever? Why is the actual Ivy/Maven repository queried so often?

Original source