Explicitly cast ByteBuffer in clear() call to Buffer.

This works around the following error:
java.lang.NoSuchMethodError: java.nio.ByteBuffer.clear()Ljava/nio/ByteBuffer;
	at com.google.devtools.build.lib.profiler.Profiler$BinaryFormatWriter.run(Profiler.java:949)
	at java.lang.Thread.run(Thread.java:748)

JDK 9 introduced an overloaded methods with covariant return type.

Closes #5886.

PiperOrigin-RevId: 208642556

2 files changed, 4 insertions, 3 deletions

diff --git a/src/java_tools/buildjar/java/com/google/devtools/build/java/bazel/BazelJavaCompiler.java b/src/java_tools/buildjar/java/com/google/devtools/build/java/bazel/BazelJavaCompiler.java
index 87910efaee..d263e30225 100644
--- a/src/java_tools/buildjar/java/com/google/devtools/build/java/bazel/BazelJavaCompiler.java
+++ b/src/java_tools/buildjar/java/com/google/devtools/build/java/bazel/BazelJavaCompiler.java
@@ -76,10 +76,10 @@ public class BazelJavaCompiler {
   private static class LangtoolsClassLoader extends URLClassLoader {
 
     public LangtoolsClassLoader() throws MalformedURLException {
-      super(new URL[] {getLangtoolsJar().toURI().toURL()}, getPlatformClassLoader());
+      super(new URL[] {getLangtoolsJar().toURI().toURL()}, getPlatformClassLoaderInternal());
     }
 
-    private static ClassLoader getPlatformClassLoader() {
+    private static ClassLoader getPlatformClassLoaderInternal() {
       try {
         return (ClassLoader) ClassLoader.class.getMethod("getPlatformClassLoader").invoke(null);
       } catch (ReflectiveOperationException e) {
diff --git a/src/main/java/com/google/devtools/build/lib/profiler/Profiler.java b/src/main/java/com/google/devtools/build/lib/profiler/Profiler.java
index fb64aa2a31..11f28965b3 100644
--- a/src/main/java/com/google/devtools/build/lib/profiler/Profiler.java
+++ b/src/main/java/com/google/devtools/build/lib/profiler/Profiler.java
@@ -32,6 +32,7 @@ import java.io.DataOutputStream;
 import java.io.IOException;
 import java.io.OutputStream;
 import java.io.OutputStreamWriter;
+import java.nio.Buffer;
 import java.nio.ByteBuffer;
 import java.nio.charset.StandardCharsets;
 import java.time.Duration;
@@ -946,7 +947,7 @@ public final class Profiler {
           ObjectDescriber describer = new ObjectDescriber();
           TaskData data;
           while ((data = queue.take()) != POISON_PILL) {
-            sink.clear();
+            ((Buffer) sink).clear();
 
             VarInt.putVarLong(data.threadId, sink);
             VarInt.putVarInt(data.id, sink);