diff --git a/build.gradle b/build.gradle
index 7de5eb75d..96aecb6ce 100644
--- a/build.gradle
+++ b/build.gradle
@@ -308,9 +308,14 @@ subprojects {
     }
   }
 
-  javadocSource << project.sourceSets.main.allJava
-  javadocClasspath << project.sourceSets.main.compileClasspath
-  javadocDependentTasks << project.tasks.compileJava
+  // No need to produce javadoc for the docs subproject, which has no APIs to
+  // expose to users.
+  if (project.name != 'docs') {
+    javadocSource << project.sourceSets.main.allJava
+    javadocClasspath << project.sourceSets.main.compileClasspath
+    javadocClasspath << "${buildDir}/generated/sources/annotationProcessor/java/main"
+    javadocDependentTasks << project.tasks.compileJava
+  }
 }
 
 // If "-P verboseTestOutput=true" is passed in, configure all subprojects to dump all of their
diff --git a/core/build.gradle b/core/build.gradle
index 55088f83b..379565399 100644
--- a/core/build.gradle
+++ b/core/build.gradle
@@ -404,7 +404,9 @@ task jaxbToJava {
         }
       }
     }
-    execInBash('find . -name *.java -exec sed -i /\\<p\\>\\$/d {} +', outputDir)
+    execInBash(
+        'find . -name *.java -exec sed -i /\\*\\ \\<p\\>\\$/d {} +',
+        generatedDir)
   }
 }
 
diff --git a/docs/build.gradle b/docs/build.gradle
index 5b458a88a..3c5a92a93 100644
--- a/docs/build.gradle
+++ b/docs/build.gradle
@@ -45,12 +45,16 @@ task flowDocsTool(type: JavaExec) {
 }
 
 tasks.compileJava {
-  options.compilerArgs = ["--add-exports", "jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED",
-                          "--add-exports", "jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED",
-                          "--add-exports", "jdk.javadoc/jdk.javadoc.internal.tool=ALL-UNNAMED"]
+  options.compilerArgs = ["--add-exports",
+                          "jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED",
+                          "--add-exports",
+                          "jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED",
+                          "--add-exports",
+                          "jdk.javadoc/jdk.javadoc.internal.tool=ALL-UNNAMED"]
 
 }
 
 tasks.test {
-  jvmArgs = ['--add-exports', 'jdk.javadoc/jdk.javadoc.internal.tool=ALL-UNNAMED']
+  jvmArgs = ['--add-exports',
+             'jdk.javadoc/jdk.javadoc.internal.tool=ALL-UNNAMED']
 }
diff --git a/java_common.gradle b/java_common.gradle
index cbd13d8b1..c444c083b 100644
--- a/java_common.gradle
+++ b/java_common.gradle
@@ -100,8 +100,12 @@ tasks.withType(JavaCompile).configureEach {
     // The -Werror flag causes Intellij to fail on deprecated api use.
     // Allow IDE user to turn off this flag by specifying a Gradle VM
     // option from inside the IDE.
-    if (System.getProperty('no_werror') != 'true') {
-        options.compilerArgs << "-Werror"
+    if (System.getProperty('no_werror') != 'true' &&
+        // The core project throws an warning about Gradle annotation processor
+        // not compatible with Java source version > 8. Re-assess once the
+        // warning is fixed.
+        getProject().name != 'core') {
+      options.compilerArgs << "-Werror"
     }
     options.errorprone.disableWarningsInGeneratedCode = true
     options.errorprone.errorproneArgumentProviders.add([