From 9a9a2d37a0c63b94dc7bfd8156d9c0914843d51b Mon Sep 17 00:00:00 2001 From: =?utf8?q?J=C3=A9r=C3=A9mie=20Galarneau?= Date: Fri, 31 Oct 2014 14:03:47 -0400 Subject: [PATCH] Fix: Try loading classes using the thread context class loader MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit LTTngAgent should load classes using the current thread context's class loader and then try using the system class loader if a ClassNotFoundException is thrown. Signed-off-by: Jérémie Galarneau Signed-off-by: Mathieu Desnoyers --- .../java/org/lttng/ust/agent/LTTngAgent.java | 26 ++++++++++++++----- 1 file changed, 20 insertions(+), 6 deletions(-) diff --git a/liblttng-ust-java-agent/java/org/lttng/ust/agent/LTTngAgent.java b/liblttng-ust-java-agent/java/org/lttng/ust/agent/LTTngAgent.java index 293ac848..47b45197 100644 --- a/liblttng-ust-java-agent/java/org/lttng/ust/agent/LTTngAgent.java +++ b/liblttng-ust-java-agent/java/org/lttng/ust/agent/LTTngAgent.java @@ -94,8 +94,7 @@ public class LTTngAgent { Class logging; try { - ClassLoader loader = ClassLoader.getSystemClassLoader(); - logging = loader.loadClass("org.apache.log4j.spi.LoggingEvent"); + logging = loadClass("org.apache.log4j.spi.LoggingEvent"); } catch (ClassNotFoundException e) { /* Log4j classes not found, no need to create the relevant objects */ return false; @@ -131,10 +130,26 @@ public class LTTngAgent { return true; } + private Class loadClass(String className) throws ClassNotFoundException { + ClassLoader loader; + Class loadedClass; + + try { + /* Try to load class using the current thread's context class loader */ + loader = Thread.currentThread().getContextClassLoader(); + loadedClass = loader.loadClass(className); + } catch (ClassNotFoundException e) { + /* Loading failed, try using the system class loader */ + loader = ClassLoader.getSystemClassLoader(); + loadedClass = loader.loadClass(className); + } + + return loadedClass; + } + private void initAgentJULClasses() { try { - ClassLoader loader = ClassLoader.getSystemClassLoader(); - Class lttngJUL = loader.loadClass("org.lttng.ust.agent.jul.LTTngJUL"); + Class lttngJUL = loadClass("org.lttng.ust.agent.jul.LTTngJUL"); this.julUser = (LogFramework)lttngJUL.getDeclaredConstructor(new Class[] {Boolean.class}).newInstance(false); this.julRoot = (LogFramework)lttngJUL.getDeclaredConstructor(new Class[] {Boolean.class}).newInstance(true); this.useJUL = true; @@ -154,8 +169,7 @@ public class LTTngAgent { private void initAgentLog4jClasses() { try { - ClassLoader loader = ClassLoader.getSystemClassLoader(); - Class lttngLog4j = loader.loadClass("org.lttng.ust.agent.log4j.LTTngLog4j"); + Class lttngLog4j = loadClass("org.lttng.ust.agent.log4j.LTTngLog4j"); this.log4jUser = (LogFramework)lttngLog4j.getDeclaredConstructor(new Class[] {Boolean.class}).newInstance(false); this.log4jRoot = (LogFramework)lttngLog4j.getDeclaredConstructor(new Class[] {Boolean.class}).newInstance(true); this.useLog4j = true; -- 2.34.1