CallStack (Apache Tomcat 10.0.27 API Documentation)

All Known Implementing Classes:

NoOpCallStack, SecurityManagerCallStack, ThrowableCallStack
```
public interface CallStack
```
Strategy for obtaining and printing the current call stack. This is primarily useful for usage tracking so that different JVMs and configurations can use more efficient strategies for obtaining the current call stack depending on metadata needs.

Since:

2.4.3

See Also:

CallStackUtils

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`clear()`	Clears the current stack trace snapshot.
`void`	`fillInStackTrace()`	Takes a snapshot of the current call stack.
`boolean`	`printStackTrace(java.io.PrintWriter writer)`	Prints the current stack trace if available to a PrintWriter.

- Method Detail
  - clear
```
void clear()
```
    Clears the current stack trace snapshot. Subsequent calls to printStackTrace(PrintWriter) will be no-ops until another call to fillInStackTrace().
  - fillInStackTrace
```
void fillInStackTrace()
```
    Takes a snapshot of the current call stack. Subsequent calls to printStackTrace(PrintWriter) will print out that stack trace until it is cleared.
  - printStackTrace
```
boolean printStackTrace(java.io.PrintWriter writer)
```
    Prints the current stack trace if available to a PrintWriter. The format is undefined and is primarily useful for debugging issues with PooledObject usage in user code.
    
    Parameters:
    
    writer - a PrintWriter to write the current stack trace to if available
    
    Returns:
    
    true if a stack trace was available to print or false if nothing was printed