Mercurial > hg > graal-jvmci-8

changeset 22453:d6bbd5d8d81e

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need to hold onto JFR Producer object to prevent it being garbage collected
author Doug Simon <doug.simon@oracle.com>
date Fri, 21 Aug 2015 16:35:29 +0200
parents b6fd47c5dc0b
children 76af33d4d504
files jvmci/jdk.internal.jvmci.hotspot.jfr/src/jdk/internal/jvmci/hotspot/jfr/events/JFREventProvider.java
diffstat 1 files changed, 10 insertions(+), 3 deletions(-) [+]
line wrap: on
line diff
--- a/jvmci/jdk.internal.jvmci.hotspot.jfr/src/jdk/internal/jvmci/hotspot/jfr/events/JFREventProvider.java	Fri Aug 21 13:18:40 2015 +0200
+++ b/jvmci/jdk.internal.jvmci.hotspot.jfr/src/jdk/internal/jvmci/hotspot/jfr/events/JFREventProvider.java	Fri Aug 21 16:35:29 2015 +0200
@@ -40,9 +40,15 @@
 
     private final boolean enabled;
 
+    /**
+     * Need to store the producer in a field so that it doesn't disappear.
+     */
+    @SuppressWarnings({"deprecation", "unused"}) private final Producer producer;
+
     @SuppressWarnings("deprecation")
     public JFREventProvider() {
         enabled = HotSpotJVMCIRuntime.runtime().getConfig().flightRecorder;
+        Producer p = null;
         if (enabled) {
             try {
                 /*
@@ -51,19 +57,20 @@
                  * doesn't show JVMCI events in the "Code" tab. There are plans to revise the JFR
                  * code for JDK 9.
                  */
-                Producer producer = new Producer("HotSpot JVM", "Oracle Hotspot JVM", "http://www.oracle.com/hotspot/jvm/");
-                producer.register();
+                p = new Producer("HotSpot JVM", "Oracle Hotspot JVM", "http://www.oracle.com/hotspot/jvm/");
+                p.register();
                 // Register event classes with Producer.
                 for (Class<?> c : JFREventProvider.class.getDeclaredClasses()) {
                     if (c.isAnnotationPresent(EventDefinition.class)) {
                         assert com.oracle.jrockit.jfr.InstantEvent.class.isAssignableFrom(c) : c;
-                        registerEvent(producer, c);
+                        registerEvent(p, c);
                     }
                 }
             } catch (URISyntaxException e) {
                 throw new InternalError(e);
             }
         }
+        this.producer = p;
     }
 
     /**