What does PermGen actually stand for

Question

I know what PermGen is  what it s used for  why it fails  how to increase it etc   What I don t know is what PermGen actually stands for  Permanent    Gen    something   Does anyone know what PermGen actually stands for

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PermGen stands for Permanent Generation   Here is a brief blurb on DDJ

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Permanent generation

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PermGen is used by the JVM to hold loaded classes   You can increase it using   -XX MaxPermSize 384m  if you re using the Sun JVM or OpenJDK   So if you get an OutOfMemoryException  PermGen you need to either make PermGen bigger or you might be having class loader problems

User · Answer

If I remember correctly  the gen stands for generation  as in a generational garbage collector  that treats younger objects differently than mid-life and  permanent  objects   Principle of locality suggests that recently created objects will be wiped out first

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Permgen stands for Permanent Generation  It is one of the JVM memory areas  It s part of Heap with fixed size by using a flag called MaxPermSize   Why the name  PermGen     This permgen was named in early days of Java  Permgen mains keeps all the meta data of loaded classes  But the problem is that once a class is loaded it ll remain in the JVM till JVM shutdown  So name permgen is opt for that  But later  dynamic loading of classes came into picture but name was not changed  But with Java 8  they have addressed that issue as well  Now permagen was renamed as MetaSpace with dynamic memory size

User · Answer

Permgen stands for Permanent Generation  It is one of the JVM memory areas  It s part of Heap with fixed size by using a flag called MaxPermSize   Why the name  PermGen     This permgen was named in early days of Java  Permgen mains keeps all the meta data of loaded classes  But the problem is that once a class is loaded it ll remain in the JVM till JVM shutdown  So name permgen is opt for that  But later  dynamic loading of classes came into picture but name was not changed  But with Java 8  they have addressed that issue as well  Now permagen was renamed as MetaSpace with dynamic memory size

User · Answer

PermGen stands for Permanent Generation   Here is a brief blurb on DDJ

User · Answer

Permanent Generation   See the java GC tuning guide for more details on the garbage collector

User · Answer

Permanent Generation  Details are of course implementation specific   Briefly  it contains the Java objects associated with classes and interned strings  In Sun s client implementation with sharing on  classes jsa is memory mapped to form the initial data  with about half read-only and half copy-on-write   Java objects that are merely old are kept in the Tenured Generation

User · Answer

Permanent Generation   See the java GC tuning guide for more details on the garbage collector

User · Answer

Permanent generation

User · Answer

If I remember correctly  the gen stands for generation  as in a generational garbage collector  that treats younger objects differently than mid-life and  permanent  objects   Principle of locality suggests that recently created objects will be wiped out first

User · Answer

Not really related match to the original question  but may be someone will find it useful  PermGen is indeed an area in memory where Java used to keep its classes  So  many of us have came across OOM in PermGen  if there were  for example a lot of classes   Since Java 8  PermGen area has been replaced by MetaSpace area  which is more efficient and is unlimited by default  or more precisely - limited by amount of native memory  depending on 32 or 64 bit jvm and OS virtual memory availability    However it is possible to tune it in some ways  by for example specifying a max limit for the area  You can find more useful information in this blog post

User · Answer

If I remember correctly  the gen stands for generation  as in a generational garbage collector  that treats younger objects differently than mid-life and  permanent  objects   Principle of locality suggests that recently created objects will be wiped out first

User · Answer

Permanent Generation   See the java GC tuning guide for more details on the garbage collector

User · Answer

Permanent Generation  Details are of course implementation specific   Briefly  it contains the Java objects associated with classes and interned strings  In Sun s client implementation with sharing on  classes jsa is memory mapped to form the initial data  with about half read-only and half copy-on-write   Java objects that are merely old are kept in the Tenured Generation

User · Answer

PermGen is used by the JVM to hold loaded classes   You can increase it using   -XX MaxPermSize 384m  if you re using the Sun JVM or OpenJDK   So if you get an OutOfMemoryException  PermGen you need to either make PermGen bigger or you might be having class loader problems

User · Answer

If I remember correctly  the gen stands for generation  as in a generational garbage collector  that treats younger objects differently than mid-life and  permanent  objects   Principle of locality suggests that recently created objects will be wiped out first

User · Answer

PermGen stands for Permanent Generation   Here is a brief blurb on DDJ

User · Answer

Permanent Generation   See the java GC tuning guide for more details on the garbage collector

User · Answer

Permanent Generation  Details are of course implementation specific   Briefly  it contains the Java objects associated with classes and interned strings  In Sun s client implementation with sharing on  classes jsa is memory mapped to form the initial data  with about half read-only and half copy-on-write   Java objects that are merely old are kept in the Tenured Generation

User · Answer

PermGen is used by the JVM to hold loaded classes   You can increase it using   -XX MaxPermSize 384m  if you re using the Sun JVM or OpenJDK   So if you get an OutOfMemoryException  PermGen you need to either make PermGen bigger or you might be having class loader problems

User · Answer

Permanent generation

User · Answer

Permanent generation

User · Answer

PermGen is used by the JVM to hold loaded classes   You can increase it using   -XX MaxPermSize 384m  if you re using the Sun JVM or OpenJDK   So if you get an OutOfMemoryException  PermGen you need to either make PermGen bigger or you might be having class loader problems

User · Answer

Permanent Generation  Details are of course implementation specific   Briefly  it contains the Java objects associated with classes and interned strings  In Sun s client implementation with sharing on  classes jsa is memory mapped to form the initial data  with about half read-only and half copy-on-write   Java objects that are merely old are kept in the Tenured Generation

User · Answer

Not really related match to the original question  but may be someone will find it useful  PermGen is indeed an area in memory where Java used to keep its classes  So  many of us have came across OOM in PermGen  if there were  for example a lot of classes   Since Java 8  PermGen area has been replaced by MetaSpace area  which is more efficient and is unlimited by default  or more precisely - limited by amount of native memory  depending on 32 or 64 bit jvm and OS virtual memory availability    However it is possible to tune it in some ways  by for example specifying a max limit for the area  You can find more useful information in this blog post

User · Answer

PermGen stands for Permanent Generation   Here is a brief blurb on DDJ

[java] What does PermGen actually stand for?

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