title: Suddenly getting "NoSuchMethodError: org.codehaus.plexus.compiler.CompilerConfiguration.isParameters" in CI build
body: <p>I'm suddenly seeing a CI Maven build failing with something like this:</p>
  
  <pre><code>[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.6.1:compile (default-compile) on project CheckoutMs: Execution default-compile of goal org.apache.maven.plugins:maven-compiler-plugin:3.6.1:compile failed: An API incompatibility was encountered while executing org.apache.maven.plugins:maven-compiler-plugin:3.6.1:compile: java.lang.NoSuchMethodError: org.codehaus.plexus.compiler.CompilerConfiguration.isParameters()Z
  [ERROR] -----------------------------------------------------
  [ERROR] realm =    plugin&gt;org.apache.maven.plugins:maven-compiler-plugin:3.6.1
  [ERROR] strategy = org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy
  [ERROR] urls[0] = file:/home/jenkins/.m2/repository/org/apache/maven/plugins/maven-compiler-plugin/3.6.1/maven-compiler-plugin-3.6.1.jar
  [ERROR] urls[1] = file:/home/jenkins/.m2/repository/org/codehaus/groovy/groovy-eclipse-compiler/3.3.0-01/groovy-eclipse-compiler-3.3.0-01.jar
  [ERROR] urls[2] = file:/home/jenkins/.m2/repository/org/codehaus/plexus/plexus-component-annotations/1.6/plexus-component-annotations-1.6.jar
  [ERROR] urls[3] = file:/home/jenkins/.m2/repository/org/apache/xbean/xbean-reflect/3.7/xbean-reflect-3.7.jar
  [ERROR] urls[4] = file:/home/jenkins/.m2/repository/com/google/collections/google-collections/1.0/google-collections-1.0.jar
  [ERROR] urls[5] = file:/home/jenkins/.m2/repository/org/codehaus/groovy/groovy-eclipse-batch/2.5.5-01/groovy-eclipse-batch-2.5.5-01.jar
  [ERROR] urls[6] = file:/home/jenkins/.m2/repository/org/sonatype/sisu/sisu-inject-bean/1.4.2/sisu-inject-bean-1.4.2.jar
  [ERROR] urls[7] = file:/home/jenkins/.m2/repository/org/sonatype/sisu/sisu-guice/2.1.7/sisu-guice-2.1.7-noaop.jar
  [ERROR] urls[8] = file:/home/jenkins/.m2/repository/org/codehaus/plexus/plexus-utils/2.0.4/plexus-utils-2.0.4.jar
  [ERROR] urls[9] = file:/home/jenkins/.m2/repository/org/sonatype/aether/aether-util/1.7/aether-util-1.7.jar
  [ERROR] urls[10] = file:/home/jenkins/.m2/repository/org/codehaus/plexus/plexus-interpolation/1.14/plexus-interpolation-1.14.jar
  [ERROR] urls[11] = file:/home/jenkins/.m2/repository/org/sonatype/plexus/plexus-sec-dispatcher/1.3/plexus-sec-dispatcher-1.3.jar
  [ERROR] urls[12] = file:/home/jenkins/.m2/repository/org/sonatype/plexus/plexus-cipher/1.4/plexus-cipher-1.4.jar
  [ERROR] urls[13] = file:/home/jenkins/.m2/repository/org/apache/maven/shared/maven-shared-utils/3.1.0/maven-shared-utils-3.1.0.jar
  [ERROR] urls[14] = file:/home/jenkins/.m2/repository/commons-io/commons-io/2.5/commons-io-2.5.jar
  [ERROR] urls[15] = file:/home/jenkins/.m2/repository/org/apache/maven/shared/maven-shared-incremental/1.1/maven-shared-incremental-1.1.jar
  [ERROR] urls[16] = file:/home/jenkins/.m2/repository/org/ow2/asm/asm/6.0_ALPHA/asm-6.0_ALPHA.jar
  [ERROR] urls[17] = file:/home/jenkins/.m2/repository/com/thoughtworks/qdox/qdox/2.0-M5/qdox-2.0-M5.jar
  [ERROR] urls[18] = file:/home/jenkins/.m2/repository/org/codehaus/plexus/plexus-compiler-api/2.8.1/plexus-compiler-api-2.8.1.jar
  [ERROR] urls[19] = file:/home/jenkins/.m2/repository/org/codehaus/plexus/plexus-compiler-manager/2.8.1/plexus-compiler-manager-2.8.1.jar
  [ERROR] urls[20] = file:/home/jenkins/.m2/repository/org/codehaus/plexus/plexus-compiler-javac/2.8.1/plexus-compiler-javac-2.8.1.jar
  [ERROR] Number of foreign imports: 1
  [ERROR] import: Entry[import  from realm ClassRealm[maven.api, parent: null]]
  </code></pre>
  
  <p>From some analysis, I can see that the "isParameters" method is available in version 2.8.3 of the plexus-compiler-api, but not in 2.8.1, which is being used here.  This is not a dependency, direct or indirect, of the project being built.</p>
  
  <p>This error is repeatable in the project where it's happening.  It started happening at 2 minutes after midnight starting on 1/26.  The previous build of this, which ran 6 minutes before that, on the previous day, did not see this symptom.</p>
  
  <p>I also looked at the git commit ids of every repository pulled from for this build, and they are identical between the last successful build and this first (and continuing) failure.</p>
  
  <p>This means that something must have changed in the infrastructure.  I don't maintain that.  A different team does.  What I'd like to get from this posting is any clues I can pass on about what might have changed that could have caused this.</p>