Uploaded image for project: 'JDK'
  1. JDK
  2. JDK-8265602

-XX:DumpLoadedClassList should support custom loaders

    XMLWordPrintable

    Details

    • Subcomponent:
    • Resolved In Build:
      b10

      Description

      When running a SpringBoot helloworld program with CDS, we found that the start up is faster with a dynamic archive than with a static archive:

      https://github.com/iklam/cds-example/blob/e70b80f4f74d2fa45171d7011e44b379dc48656a/Makefile

      # make run0 = no CDS (-Xshare:off)
      # make run1 = default CDS archive
      # make runs = static CDS archive
      # make rund = dynamic CDS archive
      #
      # Example timing (with my JDK 17 personal build/20210420)
      #
      # run0: 1.702895430 seconds time elapsed ( +- 0.48% )
      # run1: 1.573997668 seconds time elapsed ( +- 0.26% )
      # runs: 1.478010901 seconds time elapsed ( +- 0.52% )
      # rund: 1.397676981 seconds time elapsed ( +- 0.62% )

      =========================
      The reason is that classes loaded by custom loaders are supported only by the dynamic archive:

      [class,load] org.springframework.util.StopWatch$TaskInfo source: shared objects file (top)
      [class,load] .... [loader data ... a 'org/springframework/boot/loader/LaunchedURLClassLoader']

      Such classes are not stored in the static archive, so they are loaded from the JAR file at runtime:

      [info][class,load] org.springframework.util.StopWatch$TaskInfo source: jar:file:/jdk2/cds-example/target/cds-example-0.0.1-SNAPSHOT.jar!/BOOT-INF/lib/spring-core-5.3.6.jar!/

        Attachments

          Issue Links

            Activity

              People

              Assignee:
              iklam Ioi Lam
              Reporter:
              iklam Ioi Lam
              Votes:
              0 Vote for this issue
              Watchers:
              4 Start watching this issue

                Dates

                Created:
                Updated:
                Resolved: