--- a/src/hotspot/os/bsd/os_bsd.cpp	Mon Nov 11 16:59:42 2019 +0100
+++ b/src/hotspot/os/bsd/os_bsd.cpp	Mon Nov 11 12:11:34 2019 -0500
@@ -2845,15 +2845,11 @@
     // and if UserSignalHandler is installed all bets are off
     if (CheckJNICalls) {
       if (libjsig_is_loaded) {
-        if (PrintJNIResolving) {
-          tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
-        }
+        log_debug(jni, resolve)("Info: libjsig is activated, all active signal checking is disabled");
         check_signals = false;
       }
       if (AllowUserSignalHandlers) {
-        if (PrintJNIResolving) {
-          tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
-        }
+        log_debug(jni, resolve)("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
         check_signals = false;
       }
     }

--- a/src/hotspot/os/linux/os_linux.cpp	Mon Nov 11 16:59:42 2019 +0100
+++ b/src/hotspot/os/linux/os_linux.cpp	Mon Nov 11 12:11:34 2019 -0500
@@ -4789,15 +4789,11 @@
     // Log that signal checking is off only if -verbose:jni is specified.
     if (CheckJNICalls) {
       if (libjsig_is_loaded) {
-        if (PrintJNIResolving) {
-          tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
-        }
+        log_debug(jni, resolve)("Info: libjsig is activated, all active signal checking is disabled");
         check_signals = false;
       }
       if (AllowUserSignalHandlers) {
-        if (PrintJNIResolving) {
-          tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
-        }
+        log_debug(jni, resolve)("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
         check_signals = false;
       }
     }

--- a/src/hotspot/os/solaris/os_solaris.cpp	Mon Nov 11 16:59:42 2019 +0100
+++ b/src/hotspot/os/solaris/os_solaris.cpp	Mon Nov 11 12:11:34 2019 -0500
@@ -3684,15 +3684,11 @@
   // Log that signal checking is off only if -verbose:jni is specified.
   if (CheckJNICalls) {
     if (libjsig_is_loaded) {
-      if (PrintJNIResolving) {
-        tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
-      }
+      log_debug(jni, resolve)("Info: libjsig is activated, all active signal checking is disabled");
       check_signals = false;
     }
     if (AllowUserSignalHandlers) {
-      if (PrintJNIResolving) {
-        tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
-      }
+      log_debug(jni, resolve)("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
       check_signals = false;
     }
   }

--- a/src/hotspot/share/jvmci/jvmciCompilerToVM.cpp	Mon Nov 11 16:59:42 2019 +0100
+++ b/src/hotspot/share/jvmci/jvmciCompilerToVM.cpp	Mon Nov 11 12:11:34 2019 -0500
@@ -34,6 +34,8 @@
 #include "jvmci/jvmciCompilerToVM.hpp"
 #include "jvmci/jvmciCodeInstaller.hpp"
 #include "jvmci/jvmciRuntime.hpp"
+#include "logging/log.hpp"
+#include "logging/logTag.hpp"
 #include "memory/oopFactory.hpp"
 #include "memory/universe.hpp"
 #include "oops/constantPool.inline.hpp"
@@ -2296,11 +2298,9 @@
             method->name_and_sig_as_C_string(), p2i(method->native_function()), p2i(entry)));
       }
       method->set_native_function(entry, Method::native_bind_event_is_interesting);
-      if (PrintJNIResolving) {
-        tty->print_cr("[Dynamic-linking native method %s.%s ... JNI]",
-          method->method_holder()->external_name(),
-          method->name()->as_C_string());
-      }
+      log_debug(jni, resolve)("[Dynamic-linking native method %s.%s ... JNI]",
+                              method->method_holder()->external_name(),
+                              method->name()->as_C_string());
     }
   }
 

--- a/src/hotspot/share/oops/method.cpp	Mon Nov 11 16:59:42 2019 +0100
+++ b/src/hotspot/share/oops/method.cpp	Mon Nov 11 12:11:34 2019 -0500
@@ -36,6 +36,8 @@
 #include "interpreter/bytecodes.hpp"
 #include "interpreter/interpreter.hpp"
 #include "interpreter/oopMapCache.hpp"
+#include "logging/log.hpp"
+#include "logging/logTag.hpp"
 #include "memory/allocation.inline.hpp"
 #include "memory/heapInspection.hpp"
 #include "memory/metadataFactory.hpp"
@@ -448,11 +450,11 @@
   } else {
     method->clear_native_function();
   }
-  if (PrintJNIResolving) {
+  if (log_is_enabled(Debug, jni, resolve)) {
     ResourceMark rm(THREAD);
-    tty->print_cr("[Registering JNI native method %s.%s]",
-      method->method_holder()->external_name(),
-      method->name()->as_C_string());
+    log_debug(jni, resolve)("[Registering JNI native method %s.%s]",
+                            method->method_holder()->external_name(),
+                            method->name()->as_C_string());
   }
   return true;
 }

--- a/src/hotspot/share/prims/jniCheck.cpp	Mon Nov 11 16:59:42 2019 +0100
+++ b/src/hotspot/share/prims/jniCheck.cpp	Mon Nov 11 12:11:34 2019 -0500
@@ -28,6 +28,8 @@
 #include "classfile/javaClasses.inline.hpp"
 #include "classfile/systemDictionary.hpp"
 #include "classfile/vmSymbols.hpp"
+#include "logging/log.hpp"
+#include "logging/logTag.hpp"
 #include "memory/allocation.inline.hpp"
 #include "memory/guardedMemory.hpp"
 #include "oops/instanceKlass.hpp"
@@ -2303,10 +2305,7 @@
          "Mismatched JNINativeInterface tables, check for new entries");
 
   // with -verbose:jni this message will print
-  if (PrintJNIResolving) {
-    tty->print_cr("Checked JNI functions are being used to " \
-                  "validate JNI usage");
-  }
+  log_debug(jni, resolve)("Checked JNI functions are being used to validate JNI usage");
 
   return &checked_jni_NativeInterface;
 }

--- a/src/hotspot/share/prims/jvmtiEnv.cpp	Mon Nov 11 16:59:42 2019 +0100
+++ b/src/hotspot/share/prims/jvmtiEnv.cpp	Mon Nov 11 12:11:34 2019 -0500
@@ -809,14 +809,11 @@
     LogConfiguration::configure_stdout(level, false, LOG_TAGS(class, load));
     break;
   case JVMTI_VERBOSE_GC:
-    if (value == 0) {
-      LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(gc));
-    } else {
-      LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
-    }
+    LogConfiguration::configure_stdout(level, true, LOG_TAGS(gc));
     break;
   case JVMTI_VERBOSE_JNI:
-    PrintJNIResolving = value != 0;
+    level = value == 0 ? LogLevel::Off : LogLevel::Debug;
+    LogConfiguration::configure_stdout(level, true, LOG_TAGS(jni, resolve));
     break;
   default:
     return JVMTI_ERROR_ILLEGAL_ARGUMENT;

--- a/src/hotspot/share/prims/nativeLookup.cpp	Mon Nov 11 16:59:42 2019 +0100
+++ b/src/hotspot/share/prims/nativeLookup.cpp	Mon Nov 11 12:11:34 2019 -0500
@@ -27,6 +27,8 @@
 #include "classfile/symbolTable.hpp"
 #include "classfile/systemDictionary.hpp"
 #include "classfile/vmSymbols.hpp"
+#include "logging/log.hpp"
+#include "logging/logTag.hpp"
 #include "memory/oopFactory.hpp"
 #include "memory/resourceArea.hpp"
 #include "oops/instanceKlass.hpp"
@@ -413,11 +415,11 @@
     method->set_native_function(entry,
       Method::native_bind_event_is_interesting);
     // -verbose:jni printing
-    if (PrintJNIResolving) {
+    if (log_is_enabled(Debug, jni, resolve)) {
       ResourceMark rm(THREAD);
-      tty->print_cr("[Dynamic-linking native method %s.%s ... JNI]",
-        method->method_holder()->external_name(),
-        method->name()->as_C_string());
+      log_debug(jni, resolve)("[Dynamic-linking native method %s.%s ... JNI]",
+                              method->method_holder()->external_name(),
+                              method->name()->as_C_string());
     }
   }
   return method->native_function();

--- a/src/hotspot/share/runtime/arguments.cpp	Mon Nov 11 16:59:42 2019 +0100
+++ b/src/hotspot/share/runtime/arguments.cpp	Mon Nov 11 12:11:34 2019 -0500
@@ -588,6 +588,7 @@
   { "TraceSafepointCleanupTime", LogLevel::Info,  true,  LOG_TAGS(safepoint, cleanup) },
   { "TraceJVMTIObjectTagging",   LogLevel::Debug, true,  LOG_TAGS(jvmti, objecttagging) },
   { "TraceRedefineClasses",      LogLevel::Info,  false, LOG_TAGS(redefine, class) },
+  { "PrintJNIResolving",         LogLevel::Debug, true,  LOG_TAGS(jni, resolve) },
   { NULL,                        LogLevel::Off,   false, LOG_TAGS(_NO_TAG) }
 };
 
@@ -2400,9 +2401,7 @@
       } else if (!strcmp(tail, ":gc")) {
         LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
       } else if (!strcmp(tail, ":jni")) {
-        if (FLAG_SET_CMDLINE(PrintJNIResolving, true) != JVMFlag::SUCCESS) {
-          return JNI_EINVAL;
-        }
+        LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
       }
     // -da / -ea / -disableassertions / -enableassertions
     // These accept an optional class/package name separated by a colon, e.g.,

--- a/src/hotspot/share/runtime/globals.hpp	Mon Nov 11 16:59:42 2019 +0100
+++ b/src/hotspot/share/runtime/globals.hpp	Mon Nov 11 12:11:34 2019 -0500
@@ -305,9 +305,6 @@
   notproduct(bool, TraceCodeBlobStacks, false,                              \
           "Trace stack-walk of codeblobs")                                  \
                                                                             \
-  product(bool, PrintJNIResolving, false,                                   \
-          "Used to implement -v:jni")                                       \
-                                                                            \
   notproduct(bool, PrintRewrites, false,                                    \
           "Print methods that are being rewritten")                         \
                                                                             \