Move to kernel style SPDX license identifiers

[lttng-ust.git] / liblttng-ust-java-agent / java / lttng-ust-agent-log4j / org / lttng / ust / agent / log4j / LttngLog4jAgent.java

diff --git a/liblttng-ust-java-agent/java/lttng-ust-agent-log4j/org/lttng/ust/agent/log4j/LttngLog4jAgent.java b/liblttng-ust-java-agent/java/lttng-ust-agent-log4j/org/lttng/ust/agent/log4j/LttngLog4jAgent.java
index 7677e68ee66e2b2c20773e0675654d24e49f7f46..bb5deb351fe858995b28038dd151bc7d48076574 100644 (file)
--- a/liblttng-ust-java-agent/java/lttng-ust-agent-log4j/org/lttng/ust/agent/log4j/LttngLog4jAgent.java
+++ b/liblttng-ust-java-agent/java/lttng-ust-agent-log4j/org/lttng/ust/agent/log4j/LttngLog4jAgent.java
@@ -1,24 +1,15 @@
 /*
- * Copyright (C) 2015 - EfficiOS Inc., Alexandre Montplaisir <alexmonthy@efficios.com>
+ * SPDX-License-Identifier: LGPL-2.1-only
  *
- * This library is free software; you can redistribute it and/or modify it
- * under the terms of the GNU Lesser General Public License, version 2.1 only,
- * as published by the Free Software Foundation.
- *
- * This library is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
- * for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this library; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ * Copyright (C) 2015 EfficiOS Inc.
+ * Copyright (C) 2015 Alexandre Montplaisir <alexmonthy@efficios.com>
  */
 
 package org.lttng.ust.agent.log4j;
 
 import java.util.Collection;
 import java.util.Collections;
+import java.util.Enumeration;
 import java.util.List;
 import java.util.Set;
 import java.util.TreeSet;
@@ -75,10 +66,12 @@ class LttngLog4jAgent extends AbstractLttngAgent<LttngLogAppender> {
 
        private static boolean hasLttngAppenderAttached(Category logger) {
                @SuppressWarnings("unchecked")
-               List<Appender> appenders = Collections.list(logger.getAllAppenders());
-               for (Appender appender : appenders) {
-                       if (appender instanceof LttngLogAppender) {
-                               return true;
+               Enumeration<Appender> appenders = logger.getAllAppenders();
+               if (appenders != null) {
+                       for (Appender appender : Collections.list(appenders)) {
+                               if (appender instanceof LttngLogAppender) {
+                                       return true;
+                               }
                        }
                }