How to get parse of Caused by of java logs in Logstash grok-filter?

Question

Below is my config file:

filter {
if [type] == "syslog" {
     multiline {

            pattern => "^%{TIMESTAMP_ISO8601}"
            negate => true
            what => "previous"
            max_age => 7
            add_tag => [ "multiline" ]      }

    grok {
    break_on_match => false
    match => { "message" => "%{TIMESTAMP_ISO8601:logTime} %{LOGLEVEL:LogLevel} \[%{NOTSPACE:logClass}\] %{GREEDYDATA:LogMsg}" }
    match => ["message", "(.*Caused by: +%{GREEDYDATA:causedBy}$)?"]
         }
    date {
    match => [ "logTime" , "yyyyMMdd-HH:mm:ss.SSSZ", "ISO8601" ]
            timezone => "UTC"
   }
}
}

My logs :

2014-01-29 11:06:48,384 ERROR   [de.Fm.Radium.Thorium.server.bean3.vollinfo.VollinfoTransformer] A sequence of more than one item is not allowed as the third argument of c$
net.sf.saxon.trans.DynamicError: A sequence of more than one item is not allowed as the third argument of concat()
       at com.amazonaws.auth.AbstractAWSSigner.signAndBase64Encode(AbstractAWSSigner.java:71)
       at com.amazonaws.auth.AbstractAWSSigner.signAndBase64Encode(AbstractAWSSigner.java:71)
       at com.amazonaws.auth.AbstractAWSSigner.signAndBase64Encode(AbstractAWSSigner.java:71)
Caused by: com.amazonaws.AmazonClientException: Unable to calculate a request signature: Empty key
       at com.amazonaws.services.sqs.AmazonSQSClient.invoke(AmazonSQSClient.java:776)
       at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:170)
Caused by: com.amazonaws.AmazonClientException: Unable to calculate a request signature: Empty key
       at com.amazonaws.auth.AbstractAWSSigner.sign(AbstractAWSSigner.java:90)
       at com.amazonaws.auth.AbstractAWSSigner.signAndBase64Encode(AbstractAWSSigner.java:68)
2014-01-29 11:06:48,383 ERROR [stderr]   XPTY0004: A sequence of more than one item is not allowed as the third argument of concat()

What I need to capture is the whole line starting with 'Caused by' up to the line break. My Problem is ,I captur just the last one (Caused by)