sometimes build fails with "Execution failed for task ':grpc-core:compileJava'. > assert i != -1"

[morgwai]

What version of gRPC-Java are you using?

incremental build from 0376de1 to 1f90e0e but happened before also

What is your environment?

ubuntu-18.04, openJDK-11

What did you expect to see?

build should succeed cleanly

What did you see instead?

$ git fetch github 
remote: Enumerating objects: 68, done.
remote: Counting objects: 100% (68/68), done.
remote: Compressing objects: 100% (20/20), done.
remote: Total 40 (delta 15), reused 25 (delta 8), pack-reused 0
Unpacking objects: 100% (40/40), done.
From https://github.com/grpc/grpc-java
   0376de15b..1f90e0e28  master     -> github/master
$ git merge --ff-only 
Updating 0376de15b..1f90e0e28
Fast-forward
 core/src/main/java/io/grpc/util/CertificateUtils.java     |  18 +++++++--
 core/src/test/java/io/grpc/util/CertificateUtilsTest.java |  10 +++++
 testing/src/main/resources/certs/README                   |   5 +++
 testing/src/main/resources/certs/ecdsa.key                |   5 +++
 xds/src/main/java/io/grpc/xds/Bootstrapper.java           |  93 +++++++++++++++++++++++++++++++++++++++++++-
 xds/src/main/java/io/grpc/xds/BootstrapperImpl.java       | 135 +++++++++++++++++++++++++++++++++++++++++++++-------------------
 xds/src/test/java/io/grpc/xds/BootstrapperImplTest.java   |  96 +++++++++++++++++++++++++++++++++++++++++++++
 7 files changed, 318 insertions(+), 44 deletions(-)
 create mode 100644 testing/src/main/resources/certs/ecdsa.key
$ ./gradlew -PskipAndroid=true -PskipCodegen=true build
Starting a Gradle Daemon (subsequent builds will be faster)
*** Skipping the build of codegen and compilation of proto files because skipCodegen=true
  * Skipping the build of Android projects because skipAndroid=true
> Task :grpc-core:compileJava FAILED

FAILURE: Build failed with an exception.

* Where:
Build file '/home/morgwai/projects/upstreamProjects/grpc-java/core/build.gradle' line: 68

* What went wrong:
Execution failed for task ':grpc-core:compileJava'.
> assert i != -1
         | |
         | false
         -1

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 13s
9 actionable tasks: 5 executed, 4 up-to-date

simply repeating the build command made it succeed:

$ ./gradlew -PskipAndroid=true -PskipCodegen=true build
*** Skipping the build of codegen and compilation of proto files because skipCodegen=true
  * Skipping the build of Android projects because skipAndroid=true

> Task :grpc-xds:compileJava
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.

> Task :grpc-interop-testing:test
[jetty-alpn-agent][ warn] Could not find a matching alpn-boot jar for Java version: 11.0.11

> Task :grpc-netty:test
[jetty-alpn-agent][ warn] Could not find a matching alpn-boot jar for Java version: 11.0.11

BUILD SUCCESSFUL in 6m 31s
324 actionable tasks: 139 executed, 185 up-to-date

Steps to reproduce the bug

very hard to reproduce reliably: happened to me like 2 times across about 30 builds during last 2 months. As far as I remember the previous time it also happened during an incremental build, but not 100% sure.

[dapengzhang0]

I was experiencing the same issue on mac. Retry will compile successfully. Should be a bug.

[ejona86]

This is caused by #7834, although it's unclear exactly how. However, that code will be removed to resolve #7211. Instead of fixing this directly, we should just delete the code. Closing since #7834 will remove the class rewriter.

[sergiitk]

This will be properly fixed by #10406.