JDK-8177155 : Examine @CS methods when called from attached thread with no caller
  • Type: Task
  • Component: core-libs
  • Sub-Component: java.lang:reflect
  • Affected Version: 8,9
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • Submitted: 2017-03-20
  • Updated: 2022-05-16
  • Resolved: 2022-05-16
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JDK 19
19Fixed
Related Reports
Relates :  
JDK-8177136 - Caller sensitive method System::getLogger should specify what happens if there is no caller on the stack.
Relates :  
JDK-8177325 - Caller sensitive methods Logger.getLogger, Logger.getAnonymousLogger, will throw NPE if there is no caller on the stack.
Relates :  
JDK-8221530 - Field::get and reflective member access not handling caller = null when invoked by JNI code with no java frames on stack
Relates :  
JDK-8227491 - No documented method to specify initial caller frame from JNI
Relates :  
JDK-8221642 - AccessibleObject::setAccessible throws NPE when invoked by JNI code with no java frame on stack
Sub Tasks
JDK-8280902 :  
ResourceBundle::getBundle may throw NPE when invoked by JNI code with no caller frame - Resolved
JDK-8281000 :  
ClassLoader::registerAsParallelCapable throws NPE if caller is null - Resolved
JDK-8281001 :  
Examine the behavior of Class::forName if the caller is null - In Progress
JDK-8281003 :  
MethodHandles::lookup throws NPE if caller is null - Resolved
JDK-8281005 :  
System::setSecurityManager may throw NPE if the caller is null - Closed
JDK-8281006 :  
Module::getResourceAsStream should check if the resource is open unconditionally when caller is null - Resolved
JDK-8281242 :  
java.io.ObjectStreamClass::forClass and java.io.ObjectStreamField::getType throw NPE when caller is null - Closed
JDK-8281244 :  
javax.sql.rowset.serial.SerialJavaObject::getFields may throw NPE if caller is null - Closed
Description
Reflection::getCallerClass may return null if there is no caller on the stack.   We need to examine @CS methods when called from a thread attached via JNI for proper handling of the null caller class case.  We should create new tests to catch these cases.
Comments
All CSMs in JDK 19 are examined. Subtasks are created for the ones that will throw NPE or its existing behavior should be revisited.
16-05-2022
java.sql.DriverManager::getDriver, getDrivers, deregisterDriver, drivers methods check if the caller has access a driver if the driver class is visible to the caller's loader. If the caller is null, it will default to use the boot loader. java.sql.DriverManager::getConnection connects to a driver that it can access. It has access to the driver if the driver's class is visible to the caller's loader. If the caller is null, it will default to the thread's context class loader.
04-02-2022