Question & Answer
Question
Understanding java.lang.StackOverflowError and why it occurs.
Answer
What is java.lang.StackOverflowError?
System may face a java.lang.StackOverflowError if it reaches the maximum allowable stack limit.
a. JVM hits this exception when -Xss value is set to a small value.
b. The method call depth is very deep (for example, in the Create Wave agent, the depth of the wave optimizer call is roughly equal to the number of shipments assigned to a shipment group).
c. The stack frame is very large.
What is -Xss value?
-Xss, a java argument controls the size of a thread stack. Every method call creates and pushes a stack frame on to the thread’s stack. The stack frame contains, at the minimum, the method’s local variables and the method arguments.
What are the current recommendations for -Xss for SSCA?
Currently the recommendations (as shown below) are specific only to create waves or batch waves agent.
Shipment Lines per Shipment Stack Size
Group
4k 2MB
10k 4MB
15k 6MB
20k 8MB
25k 10MB
Group
4k 2MB
10k 4MB
15k 6MB
20k 8MB
25k 10MB
What are the factors to consider when deciding the -Xss value for APPSERVER JVMs?
There are no specific recommendations (it is implementation specific, depends on the available memory, number of concurrent threads etc) for the other AGENT/APPSERVER JVMs. However, bumping up the stack size to 1 MB has helped some of the customers in reducing StackOverflowError.
While recommending the stack size for APPSERVER, one should keep in mind that there will be more threads and setting a high -Xss may result in native out of the memory in some cases.
While recommending the stack size for APPSERVER, one should keep in mind that there will be more threads and setting a high -Xss may result in native out of the memory in some cases.
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Historical Number
FAQ3456
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Document Information
Modified date:
11 February 2020
UID
swg21518558