This is a small project to reproduce problems like those reported on New Relic's Java agent issue 620, Exception in thread "main" java.lang.IllegalAccessError: Update to non-static final field.
- Install sbt, the Scala Build Tool, if you do not already have it installed.
- Download newrelic-agent-7.6.0.jar into the top level of this project directory.
- Export environment variables:
export JAVA_OPTS=-javaagent:./newrelic-agent-7.6.0.jar
export NEW_RELIC_APP_NAME=akkatest
export NEW_RELIC_LICENSE_KEY=<a valid license key>
- Confirm that an appropriate version of Java is running. This problem occurs with Java 11 and 17. (I have only tested LTS versions.) I use SDKMAN! to easily switch between different Java versions.
~/akka-http-new-relic % java -version
openjdk version "11.0.11" 2021-04-20
OpenJDK Runtime Environment AdoptOpenJDK-11.0.11+9 (build 11.0.11+9)
OpenJDK 64-Bit Server VM AdoptOpenJDK-11.0.11+9 (build 11.0.11+9, mixed mode)
Run sbt test and observe the IllegalAccessError:
~/akka-http-new-relic % sbt test
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.newrelic.weave.weavepackage.NewClassAppender (file:/Users/mernst/akka-http-new-relic/newrelic-agent-7.6.0.jar) to method java.net.URLClassLoader.addURL(java.net.URL)
WARNING: Please consider reporting this to the maintainers of com.newrelic.weave.weavepackage.NewClassAppender
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
2022-05-03T16:56:12,960-0700 [50511 1] com.newrelic INFO: Configuration file not found. The agent will attempt to read required values from environment variables.
2022-05-03T16:56:12,975-0700 [50511 1] com.newrelic INFO: Using default collector host: collector.newrelic.com
2022-05-03T16:56:12,976-0700 [50511 1] com.newrelic INFO: Using default metric ingest URI: https://metric-api.newrelic.com/metric/v1
2022-05-03T16:56:12,976-0700 [50511 1] com.newrelic INFO: Using default event ingest URI: https://insights-collector.newrelic.com/v1/accounts/events
2022-05-03T16:56:13,019-0700 [50511 1] com.newrelic INFO: New Relic Agent: Writing to log file: /Users/mernst/akka-http-new-relic/logs/newrelic_agent.log
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.newrelic.weave.weavepackage.NewClassAppender (file:/Users/mernst/akka-http-new-relic/newrelic-agent-7.6.0.jar) to method java.net.URLClassLoader.addURL(java.net.URL)
WARNING: Please consider reporting this to the maintainers of com.newrelic.weave.weavepackage.NewClassAppender
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
[info] welcome to sbt 1.6.2 (AdoptOpenJDK Java 11.0.11)
[info] loading settings for project global-plugins from credentials.sbt,plugins.sbt ...
[info] loading global plugins from /Users/mernst/.sbt/1.0/plugins
[info] loading project definition from /Users/mernst/akka-http-new-relic/project
[info] loading settings for project root from build.sbt ...
[info] set current project to akka-http-new-relic (in build file:/Users/mernst/akka-http-new-relic/)
[info] VersionResourceSpec:
[info] versionRoute
[info] web.VersionResourceSpec *** ABORTED ***
[info] java.lang.IllegalAccessError: Update to non-static final field akka.http.scaladsl.server.Directives$.DoubleNumber attempted from a different method (akka$http$scaladsl$server$PathMatchers$_setter_$DoubleNumber_$eq) than the initializer method <init>
[info] at akka.http.scaladsl.server.Directives$.akka$http$scaladsl$server$PathMatchers$_setter_$DoubleNumber_$eq(Directives.scala:46)
[info] at akka.http.scaladsl.server.PathMatchers.$init$(PathMatcher.scala:478)
[info] at akka.http.scaladsl.server.Directives$.<init>(Directives.scala:46)
[info] at akka.http.scaladsl.server.Directives$.<clinit>(Directives.scala)
[info] at web.VersionResource.versionRoute(VersionResource.scala:10)
[info] at web.VersionResource.versionRoute$(VersionResource.scala:10)
[info] at web.VersionResourceSpec.versionRoute$lzycompute(VersionResourceSpec.scala:7)
[info] at web.VersionResourceSpec.versionRoute(VersionResourceSpec.scala:7)
[info] at web.VersionResourceSpec.$anonfun$new$1(VersionResourceSpec.scala:14)
[info] at org.scalatest.OutcomeOf.outcomeOf(OutcomeOf.scala:85)
[info] ...
[error] Test suite web.VersionResourceSpec failed with java.lang.IllegalAccessError: Update to non-static final field akka.http.scaladsl.server.Directives$.DoubleNumber attempted from a different method (akka$http$scaladsl$server$PathMatchers$_setter_$DoubleNumber_$eq) than the initializer method <init> .
[error] This may be due to the ClassLoaderLayeringStrategy (ScalaLibrary) used by your task.
[error] To improve performance and reduce memory, sbt attempts to cache the class loaders used to load the project dependencies.
[error] The project class files are loaded in a separate class loader that is created for each test run.
[error] The test class loader accesses the project dependency classes using the cached project dependency classloader.
[error] With this approach, class loading may fail under the following conditions:
[error]
[error] * Dependencies use reflection to access classes in your project's classpath.
[error] Java serialization/deserialization may cause this.
[error] * An open package is accessed across layers. If the project's classes access or extend
[error] jvm package private classes defined in a project dependency, it may cause an IllegalAccessError
[error] because the jvm enforces package private at the classloader level.
[error]
[error] These issues, along with others that were not enumerated above, may be resolved by changing the class loader layering strategy.
[error] The Flat and ScalaLibrary strategies bundle the full project classpath in the same class loader.
[error] To use one of these strategies, set the ClassLoaderLayeringStrategy key
[error] in your configuration, for example:
[error]
[error] set root / Test / classLoaderLayeringStrategy := ClassLoaderLayeringStrategy.ScalaLibrary
[error] set root / Test / classLoaderLayeringStrategy := ClassLoaderLayeringStrategy.Flat
[error]
[error] See ClassLoaderLayeringStrategy.scala for the full list of options.
[info] Run completed in 1 second, 657 milliseconds.
[info] Total number of tests run: 0
[info] Suites: completed 0, aborted 1
[info] Tests: succeeded 0, failed 0, canceled 0, ignored 0, pending 0
[info] *** 1 SUITE ABORTED ***
[error] Error during tests:
[error] web.VersionResourceSpec
[error] (Test / test) sbt.TestsFailedException: Tests unsuccessful
[error] Total time: 4 s, completed May 3, 2022, 4:56:23 PM
- This failure does not happen if the agent is inactive (e.g. no license key or app name set up, so agent does not start.)
- This failure does not happen with Java 8.
- This failure does not happen with agent version 7.1.1, even on Java 11+. Versions 7.2.0 and later do fail.
- This failure does not happen with Scala 2.13. It does happen with Scala 2.12 and 2.11 (not that I expect New Relic to support the long-unmaintained 2.11).
- Although this test project uses the AkkaHttp 10.1 series (10.1.15), the same problem happens with the latest release, AkkaHttp 10.2.9.
Under Scala 2.13 with Java 11, the warnings about illegal reflective access are still present but the IllegalAccessError does not happen:
~/akka-http-new-relic % sbt test
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.newrelic.weave.weavepackage.NewClassAppender (file:/Users/mernst/akka-http-new-relic/newrelic-agent-7.6.0.jar) to method java.net.URLClassLoader.addURL(java.net.URL)
WARNING: Please consider reporting this to the maintainers of com.newrelic.weave.weavepackage.NewClassAppender
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
2022-05-04T09:25:22,320-0700 [60109 1] com.newrelic INFO: Configuration file not found. The agent will attempt to read required values from environment variables.
2022-05-04T09:25:22,336-0700 [60109 1] com.newrelic INFO: Using default collector host: collector.newrelic.com
2022-05-04T09:25:22,336-0700 [60109 1] com.newrelic INFO: Using default metric ingest URI: https://metric-api.newrelic.com/metric/v1
2022-05-04T09:25:22,336-0700 [60109 1] com.newrelic INFO: Using default event ingest URI: https://insights-collector.newrelic.com/v1/accounts/events
2022-05-04T09:25:22,378-0700 [60109 1] com.newrelic INFO: New Relic Agent: Writing to log file: /Users/mernst/akka-http-new-relic/logs/newrelic_agent.log
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.newrelic.weave.weavepackage.NewClassAppender (file:/Users/mernst/akka-http-new-relic/newrelic-agent-7.6.0.jar) to method java.net.URLClassLoader.addURL(java.net.URL)
WARNING: Please consider reporting this to the maintainers of com.newrelic.weave.weavepackage.NewClassAppender
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
[info] welcome to sbt 1.6.2 (AdoptOpenJDK Java 11.0.11)
[info] loading settings for project global-plugins from credentials.sbt,plugins.sbt ...
[info] loading global plugins from /Users/mernst/.sbt/1.0/plugins
[info] loading project definition from /Users/mernst/akka-http-new-relic/project
[info] loading settings for project root from build.sbt ...
[info] set current project to akka-http-new-relic (in build file:/Users/mernst/akka-http-new-relic/)
[info] VersionResourceSpec:
[info] versionRoute
[info] - should return appVersion for a get request
[info] Run completed in 1 second, 777 milliseconds.
[info] Total number of tests run: 1
[info] Suites: completed 1, aborted 0
[info] Tests: succeeded 1, failed 0, canceled 0, ignored 0, pending 0
[info] All tests passed.
[success] Total time: 4 s, completed May 3, 2022, 9:25:32 AM
Under Scala 2.13 with Java 17, there is no IllegalAccessError and the warnings about illegal reflective access are gone (though there are new "Sharing is only supported for boot loader classes because bootstrap classpath has been appended" warnings):
~/akka-http-new-relic % sbt test
OpenJDK 64-Bit Server VM warning: Sharing is only supported for boot loader classes because bootstrap classpath has been appended
OpenJDK 64-Bit Server VM warning: Sharing is only supported for boot loader classes because bootstrap classpath has been appended
OpenJDK 64-Bit Server VM warning: Sharing is only supported for boot loader classes because bootstrap classpath has been appended
OpenJDK 64-Bit Server VM warning: Sharing is only supported for boot loader classes because bootstrap classpath has been appended
OpenJDK 64-Bit Server VM warning: Sharing is only supported for boot loader classes because bootstrap classpath has been appended
OpenJDK 64-Bit Server VM warning: Sharing is only supported for boot loader classes because bootstrap classpath has been appended
OpenJDK 64-Bit Server VM warning: Sharing is only supported for boot loader classes because bootstrap classpath has been appended
OpenJDK 64-Bit Server VM warning: Sharing is only supported for boot loader classes because bootstrap classpath has been appended
OpenJDK 64-Bit Server VM warning: Sharing is only supported for boot loader classes because bootstrap classpath has been appended
OpenJDK 64-Bit Server VM warning: Sharing is only supported for boot loader classes because bootstrap classpath has been appended
OpenJDK 64-Bit Server VM warning: Sharing is only supported for boot loader classes because bootstrap classpath has been appended
OpenJDK 64-Bit Server VM warning: Sharing is only supported for boot loader classes because bootstrap classpath has been appended
2022-05-04T09:28:06,201-0700 [60305 1] com.newrelic INFO: Configuration file not found. The agent will attempt to read required values from environment variables.
2022-05-04T09:28:06,215-0700 [60305 1] com.newrelic INFO: Using default collector host: collector.newrelic.com
2022-05-04T09:28:06,215-0700 [60305 1] com.newrelic INFO: Using default metric ingest URI: https://metric-api.newrelic.com/metric/v1
2022-05-04T09:28:06,215-0700 [60305 1] com.newrelic INFO: Using default event ingest URI: https://insights-collector.newrelic.com/v1/accounts/events
2022-05-04T09:28:06,254-0700 [60305 1] com.newrelic INFO: New Relic Agent: Writing to log file: /Users/mernst/akka-http-new-relic/logs/newrelic_agent.log
OpenJDK 64-Bit Server VM warning: Sharing is only supported for boot loader classes because bootstrap classpath has been appended
OpenJDK 64-Bit Server VM warning: Sharing is only supported for boot loader classes because bootstrap classpath has been appended
OpenJDK 64-Bit Server VM warning: Sharing is only supported for boot loader classes because bootstrap classpath has been appended
OpenJDK 64-Bit Server VM warning: Sharing is only supported for boot loader classes because bootstrap classpath has been appended
[info] welcome to sbt 1.6.2 (Eclipse Adoptium Java 17.0.2)
[info] loading settings for project global-plugins from credentials.sbt,plugins.sbt ...
[info] loading global plugins from /Users/mernst/.sbt/1.0/plugins
[info] loading project definition from /Users/mernst/akka-http-new-relic/project
[info] loading settings for project root from build.sbt ...
[info] set current project to akka-http-new-relic (in build file:/Users/mernst/akka-http-new-relic/)
[info] VersionResourceSpec:
[info] versionRoute
[info] - should return appVersion for a get request
[info] Run completed in 1 second, 590 milliseconds.
[info] Total number of tests run: 1
[info] Suites: completed 1, aborted 0
[info] Tests: succeeded 1, failed 0, canceled 0, ignored 0, pending 0
[info] All tests passed.
[success] Total time: 4 s, completed May 4, 2022, 9:28:16 AM