In fact i'm not sure the pulse plugin is working correctly  

.
I tinkered with the pulse pugin and reversed to the default options :
[size=8pt][i][pulse]
cache_expire_timeout=1200
editable_templates=false
health_expire_timeout=30
install_templates=true
max_widgets_per_user=0
snapshot_expire_timeout=24[/i][/size]
With these options I have the following error in the gax init log file :
[size=8pt][i]2015-08-05 14:38:29,449 INFO : com.genesyslab.gax.wbrt.main.EZPulsePlugin [Thread-16] - [90] Db Schema Version for plugin pulse version 8.5.001.02 is matching.
2015-08-05 14:38:29,449 INFO : com.genesyslab.gax.wbrt.main.EZPulsePlugin [Thread-16] - [65] Plugin pulse 8.5.102.03 initialization...
2015-08-05 14:38:29,449 INFO : com.genesyslab.gax.wbrt.main.EZPulsePlugin [Thread-16] - [67] Plugin pulse is using Pulse Proto 8.5.102.03
2015-08-05 14:38:29,496 DEBUG: com.genesyslab.gax.wbrt.dao.CfgDaoImpl [Thread-16] - [539] Unable to get parameter cluster-size from cluster section of Collector (159) application! Key: cluster not found. Default value 1 will be used.
2015-08-05 14:38:29,496 DEBUG: com.genesyslab.gax.wbrt.dao.CfgDaoImpl [Thread-16] - [539] Unable to get parameter cluster-instance-id from cluster section of Collector (159) application! Key: cluster not found. Default value 0 will be used.
2015-08-05 14:38:29,589 DEBUG: com.genesyslab.gax.wbrt.dao.LayoutDaoImpl [Thread-16] - [377] SELECT      APPLICATION_KEY
FROM        WBRT_APPLICATION
WHERE       APPLICATION_DBID = :APPLICATION_DBID
2015-08-05 14:38:29,589 DEBUG: com.genesyslab.gax.wbrt.dao.LayoutDaoImpl [Thread-16] - [372] DELETE
FROM        WBRT_APPLICATION
WHERE       APPLICATION_KEY = :APPLICATION_KEY
2015-08-05 14:38:29,589 DEBUG: com.genesyslab.gax.wbrt.dao.LayoutDaoImpl [Thread-16] - [372] INSERT INTO WBRT_APPLICATION (APPLICATION_KEY,
            APPLICATION_DBID,
            APPLICATION_TYPE,
            APPLICATION_NAME,
            COLLECTOR_GROUP_ID)
VALUES      (:APPLICATION_KEY,
            :APPLICATION_DBID,
            :APPLICATION_TYPE,
            :APPLICATION_NAME,
            :COLLECTOR_GROUP_ID)
2015-08-05 14:38:30,120 DEBUG: com.genesyslab.gax.wbrt.dao.LayoutDaoImpl [Thread-16] - [377] SELECT      COUNT(APPLICATION_KEY)
FROM        WBRT_APPLICATION
WHERE       APPLICATION_DBID = :APPLICATION_DBID
AND         APPLICATION_KEY = :APPLICATION_KEY
2015-08-05 14:38:30,120 DEBUG: com.genesyslab.gax.wbrt.dao.LayoutDaoImpl [Thread-16] - [372] INSERT INTO WBRT_APPLICATION (APPLICATION_KEY,
            APPLICATION_DBID,
            APPLICATION_TYPE,
            APPLICATION_NAME,
            COLLECTOR_GROUP_ID)
VALUES      (:APPLICATION_KEY,
            :APPLICATION_DBID,
            :APPLICATION_TYPE,
            :APPLICATION_NAME,
            :COLLECTOR_GROUP_ID)
2015-08-05 14:38:30,120 DEBUG: com.genesyslab.gax.wbrt.dao.LayoutDaoImpl [Thread-16] - [377] SELECT      APPLICATION_KEY
FROM        WBRT_APPLICATION
WHERE       APPLICATION_DBID = :APPLICATION_DBID
2015-08-05 14:38:30,120 DEBUG: com.genesyslab.gax.wbrt.dao.LayoutDaoImpl [Thread-16] - [372] UPDATE      WBRT_LAYOUT
SET         REQUESTED_STATUS = 1,
            USCN = :USCN
WHERE       REQUESTED_STATUS = 2
AND         APPLICATION_KEY = :APPLICATION_KEY
2015-08-05 14:38:30,120 DEBUG: com.genesyslab.gax.wbrt.dao.LayoutDaoImpl [Thread-16] - [377] SELECT      APPLICATION_KEY
FROM        WBRT_APPLICATION
WHERE       APPLICATION_DBID = :APPLICATION_DBID
2015-08-05 14:38:30,120 DEBUG: com.genesyslab.gax.wbrt.dao.LayoutDaoImpl [Thread-16] - [382] SELECT        LAYOUT_BODY, BODY_HASH_1, BODY_HASH_2, USCN, REQUESTED_STATUS
FROM          WBRT_LAYOUT
WHERE         TENANT_ID = :TENANT_ID
AND           APPLICATION_KEY IN (0, :APPLICATION_KEY)
2015-08-05 14:38:31,259 ERROR: com.genesyslab.gax.core.plugin.DefaultPluginManagerImpl [Thread-16] - [177] Plugin pulse throw exception during init()
2015-08-05 14:38:31,259 ERROR: com.genesyslab.gax.core.plugin.DefaultPluginManagerImpl [Thread-16] - [179] com.google.protobuf.LazyStringList.getUnmodifiableView()Lcom/google/protobuf/LazyStringList;
java.lang.NoSuchMethodError: com.google.protobuf.LazyStringList.getUnmodifiableView()Lcom/google/protobuf/LazyStringList;
	at com.genesyslab.gax.wbrt.entities.proto.WbrtProto2Full$Widget$View$Builder.buildPartial(WbrtProto2Full.java:23783)
	at com.genesyslab.gax.wbrt.entities.proto.WbrtProto2Full$Widget$View$Builder.buildPartial(WbrtProto2Full.java:23662)
	at com.google.protobuf.TextFormat.mergeField(TextFormat.java:1159)
	at com.google.protobuf.TextFormat.mergeField(TextFormat.java:1156)
	at com.google.protobuf.TextFormat.mergeField(TextFormat.java:1156)
	at com.google.protobuf.TextFormat.merge(TextFormat.java:1062)
	at com.google.protobuf.TextFormat.merge(TextFormat.java:1028)
	at com.google.protobuf.TextFormat.merge(TextFormat.java:998)
	at com.genesyslab.gax.wbrt.main.EZPulsePlugin.populateLayoutTemplates(EZPulsePlugin.java:172)
	at com.genesyslab.gax.wbrt.main.EZPulsePlugin.init(EZPulsePlugin.java:76)
	at com.genesyslab.gax.core.plugin.DefaultPluginManagerImpl$1.run(DefaultPluginManagerImpl.java:169)
	at java.lang.Thread.run(Unknown Source)[/i][/size]
But I'l at loss to understand why the plugin throw this error  

Regards