Ignore gc alloc metrics when unsupported (#3225)

* simply ignore when it's unsupported
elastic · Jul 10, 2023 · 71bbdf7 · 71bbdf7
1 parent 86184c5
commit 71bbdf7
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diff --git a/CHANGELOG.asciidoc b/CHANGELOG.asciidoc
@@ -35,6 +35,7 @@ Use subheadings with the "=====" level for adding notes for unreleased changes:
 ===== Bug fixes
 * Fixed agent programmatic attach with immutable config - {pull}3170[#3170]
 * Prevent overriding `ELASTIC_APM_AWS_LAMBDA_HANDLER` in AWS lambda execution when explicitly set - {pull}3205[#3205]
+* Ignore gc allocation metrics when unsupported - {pull}3225[#3225]
 
 [[release-notes-1.x]]
 === Java Agent version 1.x

diff --git a/apm-agent-core/src/main/java/co/elastic/apm/agent/metrics/builtin/JvmGcMetrics.java b/apm-agent-core/src/main/java/co/elastic/apm/agent/metrics/builtin/JvmGcMetrics.java
@@ -62,11 +62,17 @@ public double get() {
             // J9 does contain com.sun.management.ThreadMXBean in classpath
             // but the actual MBean it uses (com.ibm.lang.management.internal.ExtendedThreadMXBeanImpl) does not implement it
             if (sunBeanClass.isInstance(ManagementFactory.getThreadMXBean())) {
+
+                DoubleSupplier supplier = (DoubleSupplier) Class.forName(getClass().getName() + "$HotspotAllocationSupplier").getEnumConstants()[0];
+
+                // attempt to read it at least once before registering
+                supplier.get();
+
                 // in reference to JMH's GC profiler (gc.alloc.rate)
-                registry.add("jvm.gc.alloc", Labels.EMPTY,
-                    (DoubleSupplier) Class.forName(getClass().getName() + "$HotspotAllocationSupplier").getEnumConstants()[0]);
+                registry.add("jvm.gc.alloc", Labels.EMPTY, supplier);
             }
         } catch (ClassNotFoundException ignore) {
+        } catch (UnsupportedOperationException ignore){
         }
     }