The active alarms is showing this error message:
PreparedStatementCallback; uncategorized SQLException for SQL [select id, data from eventHandlers where eventTypeId=? and eventTypeRef1=? and (eventTypeRef2=? or eventTypeRef2=0)]; SQL state [XJ001]; error code ; Java exception: 'Java heap space: java.lang.OutOfMemoryError'.; nested exception is java.sql.SQLException: Java exception: 'Java heap space: java.lang.OutOfMemoryError'.
How much memory does your host system have? You can adjust the maximum heap size of your instance with options such as -Xmx. (Which you can set in your Tomcat start scripts. Look for the JAVA_OPTS setting.)
I believe the default max heap size in Java is 64MB. If you wanted to change this to 256MB, you would add the option "-Xmx256M".