Hi Luis,
From the dump it seems one of your PI mapping is creating hash map object and occupying lot of space in the java run time memory. you need to find out the map which is using the memory (the full trace will help to identify the object.
Please refer the below sap help
Analyzing Out-of-Memory Situations - SAP Documentation
also refer the below discussion
Java Mapping - Memory Use & Memory Recovery | SCN
regards,
Harish