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https://issues.apache.org/jira/browse/AVRO-1781?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15093689#comment-15093689
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Tom White commented on AVRO-1781:
---------------------------------
This is probably the most pragmatic approach to take. Do you want to
incorporate the fix for AVRO-1760 at the same time?
I get a NPE when I run {{mvn clean install -DskipTests -e}}:
{noformat}
[ERROR] Failed to execute goal
org.apache.avro:avro-maven-plugin:1.9.0-SNAPSHOT:schema (schemas) on project
avro-ipc: Execution schemas of goal
org.apache.avro:avro-maven-plugin:1.9.0-SNAPSHOT:schema failed.
NullPointerException -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal
org.apache.avro:avro-maven-plugin:1.9.0-SNAPSHOT:schema (schemas) on project
avro-ipc: Execution schemas of goal
org.apache.avro:avro-maven-plugin:1.9.0-SNAPSHOT:schema failed.
{noformat}
> Schema.parse is not thread safe
> -------------------------------
>
> Key: AVRO-1781
> URL: https://issues.apache.org/jira/browse/AVRO-1781
> Project: Avro
> Issue Type: Bug
> Components: java
> Affects Versions: 1.8.0
> Reporter: Sean Busbey
> Priority: Blocker
> Fix For: 1.8.0
>
> Attachments: AVRO-1781.1.patch
>
>
> Post AVRO-1497, Schema.parse calls {{LogicalTypes.fromSchemaIgnoreInvalid}}
> on any schema that is expressed as a JSON object (anything except bare
> primitives).
> That static method relies on a static cache based on WeakIdentityHashMap
> (WIHM).
> WIHM clearly states that it isn't threadsafe
> [ref|https://github.com/apache/avro/blob/branch-1.8/lang/java/avro/src/main/java/org/apache/avro/util/WeakIdentityHashMap.java#L42]
> {code}
> *
> * Note that this implementation is not synchronized.
> * </b>
> */
> public class WeakIdentityHashMap<K, V> implements Map<K, V> {
> {code}
> All of the Schema.Parser instances use that same static Schema.parse method.
> The end result is that as-is it's only safe to have a single thread parsing
> schemas in a given JVM.
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