JVMCI015:OutOfMemoryError, cannot create anymore threads due to memory or resource

Hi,
Our IS has crashed with “JVMCI015:OutOfMemoryError, cannot create anymore threads due to memory or resource constraints” error.we are running on aix.Nothing has changed on webMethods ,AIX or database side.Please advise

we are running on 6.5 sp3 .the following are logs,server,memory settings

2012-02-20 06:04:01 PST [ISP.0090.0004E] ERROR – java.lang.NullPointerException
2012-02-20 06:04:01 PST [ISP.0090.0004E] SERVCE – Complete
2012-02-20 06:14:14 PST [ISU.0000.9999E] java.lang.OutOfMemoryError: JVMCI015:OutOfMemoryError, cannot create anymore threads due to memory or resource constraints
2012-02-20 06:14:14 PST [ISU.0000.9999E] java.lang.OutOfMemoryError: JVMCI015:OutOfMemoryError, cannot create anymore threads due to memory or resource constraints
2012-02-20 06:14:14 PST [ISU.0000.9999E] java.lang.OutOfMemoryError: JVMCI015:OutOfMemoryError, cannot create anymore threads due to memory or resource constraints
2012-02-20 06:14:14 PST [ISU.0000.9999E] java.lang.OutOfMemoryError: JVMCI015:OutOfMemoryError, cannot create anymore threads due to memory or resource constraints
2012-02-20 06:14:14 PST [ISU.0000.9999E] java.lang.OutOfMemoryError: JVMCI015:OutOfMemoryError, cannot create anymore threads due to memory or resource constraints
2012-02-20 06:14:14 PST [ISU.0000.9999E] java.lang.OutOfMemoryError: JVMCI015:OutOfMemoryError, cannot create anymore threads due to memory or resource constraints
2012-02-20 06:14:14 PST [ISU.0000.9999E] java.lang.OutOfMemoryError: JVMCI015:OutOfMemoryError, cannot create anymore threads due to memory or resource constraints
2012-02-20 06:14:15 PST [ISP.0090.0004E] ERROR – Failed to create a blank doc in TN
2012-02-20 06:14:15 PST [ISP.0090.0004E] ERROR – Failed to create a blank doc in TN
2012-02-20 06:14:16 PST [ISP.0090.0004E] ERROR – Failed to create a blank doc in TN
2012-02-20 06:14:16 PST [ISP.0090.0004E] ERROR – Failed to create a blank doc in TN
2012-02-20 06:14:16 PST [ISP.0090.0004E] ERROR – Failed to create a blank doc in TN
2012-02-20 06:14:16 PST [ISP.0090.0004E] ERROR – Failed to create a blank doc in TN
2012-02-20 06:14:16 PST [ISP.0090.0004E] ERROR – Failed to create a blank doc in TN
2012-02-20 06:14:24 PST [ISP.0090.0004E] ERROR – java.lang.NullPointerException
2012-02-20 06:22:43 PST [ISP.0090.0004E] ERROR – java.lang.NullPointerException
2012-02-20 06:22:43 PST [ISP.0090.0004E] ERROR – java.lang.NullPointerException
2012-02-20 06:22:43 PST [ISP.0090.0004E] ERROR – java.lang.NullPointerException
2012-02-20 06:22:44 PST [ISP.0090.0003C] “EDIX_OPEX_CBM.flows:ProcessAnalyze” service failed…JVMCI015:OutOfMemoryError, cannot create anymore threads due to memory or resource constraints
2012-02-20 06:22:44 PST [ISP.0090.0004E] ERROR – JVMCI015:OutOfMemoryError, cannot create anymore threads due to memory or resource constraints
2012-02-20 06:22:44 PST [ISP.0090.0004E] ERROR – “EDIX_OPEX_CBM.flows:ProcessAnalyze” service failed…JVMCI015:OutOfMemoryError, cannot create anymore threads due to memory or resource constraints
2012-02-20 06:22:45 PST [ISP.0090.0004E] ERROR – java.lang.NullPointerException
2012-02-20 06:22:45 PST [ISP.0090.0004E] ERROR – Could not read Properties file. filename is null!
2012-02-20 06:22:45 PST [ISP.0090.0004E] SERVCE – Complete
2012-02-20 06:25:46 PST [ISP.0090.0004E] ERROR – java.lang.NullPointerException
2012-02-20 06:25:46 PST [ISP.0090.0004E] SERVCE – Complete
2012-02-20 06:25:47 PST [ISP.0090.0004E] ERROR – java.lang.NullPointerException
2012-02-20 06:25:47 PST [ISP.0090.0004E] SERVCE – Complete
2012-02-20 06:25:47 PST [ISP.0090.0004E] ERROR – java.lang.NullPointerException
2012-02-20 06:25:47 PST [ISP.0090.0004E] SERVCE – Complete
2012-02-20 06:25:48 PST [ISP.0090.0004E] ERROR – java.lang.NullPointerException
2012-02-20 06:25:48 PST [ISP.0090.0004E] SERVCE – Complete
2012-02-20 06:25:48 PST [ISP.0090.0004E] ERROR – java.lang.NullPointerException
2012-02-20 06:25:48 PST [ISP.0090.0004E] SERVCE – Complete
2012-02-20 06:25:48 PST [ISP.0090.0004E] ERROR – java.lang.NullPointerException
2012-02-20 06:25:48 PST [ISP.0090.0004E] SERVCE – Complete
2012-02-20 06:25:48 PST [ISP.0090.0004E] ERROR – java.lang.NullPointerException
2012-02-20 06:25:48 PST [ISP.0090.0004E] SERVCE – Complete
2012-02-20 06:25:48 PST [ISP.0090.0004E] ERROR – java.lang.NullPointerException
2012-02-20 06:25:48 PST [ISP.0090.0004E] SERVCE – Complete
2012-02-20 06:25:48 PST [ISP.0090.0004E] ERROR – java.lang.NullPointerException
2012-02-20 06:25:48 PST [ISP.0090.0004E] SERVCE – Complete
2012-02-20 06:25:48 PST [ISP.0090.0004E] ERROR – java.lang.NullPointerException
2012-02-20 06:25:48 PST [ISP.0090.0004E] SERVCE – Complete
2012-02-20 06:25:48 PST [ISP.0090.0004E] ERROR – java.lang.NullPointerException
2012-02-20 06:25:48 PST [ISP.0090.0004E] SERVCE – Complete
2012-02-20 06:25:49 PST [ISP.0090.0004E] ERROR – JVMCI015:OutOfMemoryError, cannot create anymore threads due to memory or resource constraints
2012-02-20 06:25:49 PST [ISP.0090.0004E] SERVCE – Complete
2012-02-20 06:25:49 PST [ISP.0090.0004E] ERROR – java.lang.NullPointerException
2012-02-20 06:25:49 PST [ISP.0090.0004E] SERVCE – Complete

Threads settings:

                       watt.server.eventMgr.maxThreads=450watt.server.cronMaxThreads=500

watt.server.scheduler.maxThreads=500

Memory settings:

                         ### Production server

JAVA_MIN_MEM=2048M
JAVA_MAX_MEM=2048M

JAVA_MEMSET="-ms${JAVA_MIN_MEM} -mx${JAVA_MAX_MEM}"
JAVA_ARG1="-XdoCloseWithReadPending"

What’s total RAM Size on the host machine?

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