[
https://issues.apache.org/jira/browse/XMLBEANS-616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17566842#comment-17566842
]
PJ Fanning commented on XMLBEANS-616:
-------------------------------------
[~yanglinfu] there are no synchronize commsnds used in XmlBeans.java or
SchemaTypeLoaderBase.java.
The thread dump you provided seems to indicate that the issue is not with
object locking but with wait() calls.
Example
```
"pool-13-thread-1" #112 prio=5 os_prio=0 tid=0x00002ae578861800 nid=0x19ab in
Object.wait() [0x00002ae5c100c000]
java.lang.Thread.State: RUNNABLE
at
org.apache.xmlbeans.impl.schema.SchemaTypeLoaderBase.<clinit>(SchemaTypeLoaderBase.java:38)
```
This wait() is not SchemaTypeLoaderBase.java and is maybe coming from the Java
classloader code.
> is there a dead lock in loading the SOAP Service Concurrently
> -------------------------------------------------------------
>
> Key: XMLBEANS-616
> URL: https://issues.apache.org/jira/browse/XMLBEANS-616
> Project: XMLBeans
> Issue Type: Bug
> Reporter: yanglinfu
> Priority: Major
> Attachments: 007337a1-7e50-40bc-ac1f-d2ebd469f095.png, 1.7z,
> 2a6c2727-50e1-4ccc-a2f5-33abd746117a.png,
> 40f87ce3-cbcd-495e-9ce7-0ae861a3bdb7.png,
> b3d30bc4-a060-419a-b990-503b188fe262.png, image-2022-07-14-09-54-42-466.png,
> image-2022-07-14-09-55-15-029.png, image-2022-07-14-14-04-52-429.png
>
>
> *i have 10 threads to loading the SOAP Service Concurrently,and i find a dead
> lock in xmlBeans's some class loading process.*
> Thread1 info:
> "pool-13-thread-9" #120 prio=5 os_prio=0 tid=0x00002ae578872800 nid=0x19b4 in
> Object.wait() [0x00002ae5c1814000]
> java.lang.Thread.State: RUNNABLE
> at org.apache.xmlbeans.XmlBeans.getNoType(XmlBeans.java:504)
> at org.apache.xmlbeans.XmlBeans.<clinit>(XmlBeans.java:517)
> at
> org.apache.xmlbeans.impl.schema.XmlObjectFactory.<init>(XmlObjectFactory.java:41)
> at org.apache.xmlbeans.XmlObject.<clinit>(XmlObject.java:128)
> at sun.misc.Unsafe.ensureClassInitialized(Native Method)
> at
> sun.reflect.UnsafeFieldAccessorFactory.newFieldAccessor(UnsafeFieldAccessorFactory.java:43)
> at
> sun.reflect.ReflectionFactory.newFieldAccessor(ReflectionFactory.java:156)
> at java.lang.reflect.Field.acquireFieldAccessor(Field.java:1088)
> at java.lang.reflect.Field.getFieldAccessor(Field.java:1069)
> at java.lang.reflect.Field.get(Field.java:393)
>
> Thread2 info :
> "pool-13-thread-1" #112 prio=5 os_prio=0 tid=0x00002ae578861800 nid=0x19ab in
> Object.wait() [0x00002ae5c100c000]
> java.lang.Thread.State: RUNNABLE
> at
> org.apache.xmlbeans.impl.schema.SchemaTypeLoaderBase.<clinit>(SchemaTypeLoaderBase.java:38)
> at
> com.***.***.service.QueryRecommendOfferingsReqMsgDocument.<clinit>(QueryRecommendOfferingsReqMsgDocument.java:23)
> at sun.misc.Unsafe.ensureClassInitialized(Native Method)
> at
> sun.reflect.UnsafeFieldAccessorFactory.newFieldAccessor(UnsafeFieldAccessorFactory.java:43)
> at
> sun.reflect.ReflectionFactory.newFieldAccessor(ReflectionFactory.java:156)
> at java.lang.reflect.Field.acquireFieldAccessor(Field.java:1088)
> at java.lang.reflect.Field.getFieldAccessor(Field.java:1069)
> at java.lang.reflect.Field.get(Field.java:393)
>
> *xmlBeans code analyze*
> 1.the object XmlBeans init is waiting for BuiltinSchemaTypeSystem inited
> !007337a1-7e50-40bc-ac1f-d2ebd469f095.png!
> 2. BuiltinSchemaTypeSystem is the sub class of SchemaTypeLoaderBase ,so
> BuiltinSchemaTypeSystem is inited after SchemaTypeLoaderBase ;
> !b3d30bc4-a060-419a-b990-503b188fe262.png!
> 3. SchemaTypeLoaderBase init is need XmlBeans init in line 38;
>
> !2a6c2727-50e1-4ccc-a2f5-33abd746117a.png!
>
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