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Merge pull request #648 from jakewins/rollback-causes
Set cause on RollbackException
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56 changes: 56 additions & 0 deletions
56
kernel/src/main/java/org/neo4j/kernel/impl/util/ExceptionCauseSetter.java
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| Original file line number | Diff line number | Diff line change |
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| /** | ||
| * Copyright (c) 2002-2012 "Neo Technology," | ||
| * Network Engine for Objects in Lund AB [http://neotechnology.com] | ||
| * | ||
| * This file is part of Neo4j. | ||
| * | ||
| * Neo4j is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program 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 General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
| package org.neo4j.kernel.impl.util; | ||
|
|
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| import java.lang.reflect.Field; | ||
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| /** | ||
| * Because the JTA spec was built before java exceptions | ||
| * supported "cause", we can't directly set the cause on | ||
| * those exceptions when we want to throw them. | ||
| * | ||
| * However, since they extend normal java exceptions which | ||
| * today do support "cause", we can set the cause of old exception | ||
| * classes using introspection, which is what this class does. | ||
| */ | ||
| public class ExceptionCauseSetter { | ||
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| public static void setCause(Throwable original, Throwable cause) | ||
| { | ||
| try { | ||
| Field field = Throwable.class.getDeclaredField("cause"); | ||
| field.setAccessible(true); | ||
| field.set(original, cause); | ||
| } catch (Exception e) { | ||
| // Failed to set cause. Don't throw an exception from this | ||
| // as we are most likely already recovering from an exception, | ||
| // and being unable to set the cause is most likely a JVM issue | ||
| // that the user can't help anyway. | ||
| // Print an exception from this though, including the cause exception | ||
| // to help debugging. | ||
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| // TODO: Use proper logging. | ||
| Exception error = new Exception("Unable to set cause of exception (see nested), will print stacktrace of the exception causing all this below.",e); | ||
| error.printStackTrace(); | ||
| cause.printStackTrace(); | ||
| } | ||
| } | ||
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|
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| } |
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