Getting NullPointerException while invoking a Rule for a method having argument as Long

I am getting a NPE in my application while using a Byteman rule.
I created a test java code and simulated the same issue, call to method m2 is generating NPE
Version:
/projects/byteman-download-4.0.23

Following is the java code:

import java.util.*;

public class npe {
  public static void main(String args[]) {
    Long l=System.currentTimeMillis();
    Long lx=null;

    m1(l);
    m2(lx);
  }
  
  static void m1(Long l1)
  {
    System.out.println("l1 = " + l1);  
  }
  
   static void m2(Long l2)
  {
    System.out.println("l2 new = " + l2);  
  }
}

Following is the byteman script:

RULE catch.npe.m1
CLASS npe
METHOD m1
COMPILE
AT ENTRY
IF true
DO
 System.out.println("[BMAN] Got Method Trigger: m1 [" + $1 + "]");
ENDRULE

RULE catch.npe.m2
CLASS npe
METHOD m2
COMPILE
AT ENTRY
IF true
DO
 System.out.println("[BMAN] Got Method Trigger: m2 [" + $1 + "]");
ENDRULE

Now executing the java program:

[root@asif-me btest]# java -Dorg.jboss.byteman.verbose   -Dorg.jboss.byteman.dump.generated.classes   -Dorg.jboss.byteman.dump.generated.classes.directory=/projects/tools/btest/decomp -javaagent:${BYTEMAN_HOME}/lib/byteman.jar=script:npe.btm -Dorg.jboss.byteman.compile.to.bytecode npe
AccessManager:init Initialising JDK9 AccessManager
AccessManager:init created module
AccessManager:init added extraReads
org.jboss.byteman.agent.Transformer : Saving transformed bytes to /projects/tools/btest/decomp/org/jboss/byteman/jigsaw/JigsawAccessEnabler.class
AccessManager:init returning JigsawAccessEnabler
org.jboss.byteman.agent.Transformer : possible trigger for rule catch.npe.m2 in class npe
RuleTriggerMethodAdapter.injectTriggerPoint : inserting trigger into npe.m2(java.lang.Long) void for rule catch.npe.m2
org.jboss.byteman.agent.Transformer : inserted trigger for catch.npe.m2 in class npe
org.jboss.byteman.agent.Transformer : possible trigger for rule catch.npe.m1 in class npe
RuleTriggerMethodAdapter.injectTriggerPoint : inserting trigger into npe.m1(java.lang.Long) void for rule catch.npe.m1
org.jboss.byteman.agent.Transformer : inserted trigger for catch.npe.m1 in class npe
org.jboss.byteman.agent.Transformer : Saving transformed bytes to /projects/tools/btest/decomp/npe.class
Rule.execute called for catch.npe.m1_0:0
org.jboss.byteman.agent.Transformer : Saving transformed bytes to /projects/tools/btest/decomp/org/jboss/byteman/rule/helper/Helper_HelperAdapter_Compiled_1.class
HelperManager.install for helper class org.jboss.byteman.rule.helper.Helper
calling activated() for helper class org.jboss.byteman.rule.helper.Helper
Default helper activated
calling installed(catch.npe.m1) for helper classorg.jboss.byteman.rule.helper.Helper
Installed rule using default helper : catch.npe.m1
catch.npe.m1 execute()
[BMAN] Got Method Trigger: m1 [1727221411198]
l1 = 1727221411198
Rule.execute called for catch.npe.m2_1:0
org.jboss.byteman.agent.Transformer : Saving transformed bytes to /projects/tools/btest/decomp/org/jboss/byteman/rule/helper/Helper_HelperAdapter_Compiled_2.class
HelperManager.install for helper class org.jboss.byteman.rule.helper.Helper
calling installed(catch.npe.m2) for helper classorg.jboss.byteman.rule.helper.Helper
Installed rule using default helper : catch.npe.m2
catch.npe.m2 execute()
catch.npe.m2 : java.lang.NullPointerException
caught ExecuteException
Exception in thread "main" org.jboss.byteman.rule.exception.ExecuteException: catch.npe.m2  : caught java.lang.NullPointerException
    at org.jboss.byteman.rule.Rule.execute(Rule.java:852)
    at org.jboss.byteman.rule.Rule.execute(Rule.java:789)
    at npe.m2(npe.java)
    at npe.main(npe.java:9)
Caused by: java.lang.NullPointerException
    at org.jboss.byteman.rule.helper.Helper_HelperAdapter_Compiled_2.execute(npe.btm)
    at org.jboss.byteman.rule.Rule.execute(Rule.java:820)
    ... 3 more
[root@asif-me btest]#

The generated code from dumped class file:

[root@asif-me decomp]# javap -v -p -s -c  npe.class
Classfile /projects/tools/btest/decomp/npe.class
  Last modified Sep 25, 2024; size 1806 bytes
  MD5 checksum 7160079c97164a866b71ec6497fec007
  Compiled from "npe.java"
public class npe
  minor version: 0
  major version: 55
  flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: #2                          // npe
  super_class: #4                         // java/lang/Object
  interfaces: 0, fields: 0, methods: 4, attributes: 3
Constant pool:
   #1 = Utf8               npe
   #2 = Class              #1             // npe
   #3 = Utf8               java/lang/Object
   #4 = Class              #3             // java/lang/Object
   #5 = Utf8               npe.java
   #6 = Utf8               java/lang/invoke/MethodHandles$Lookup
   #7 = Class              #6             // java/lang/invoke/MethodHandles$Lookup
   #8 = Utf8               java/lang/invoke/MethodHandles
   #9 = Class              #8             // java/lang/invoke/MethodHandles
  #10 = Utf8               Lookup
  #11 = Utf8               <init>
  #12 = Utf8               ()V
  #13 = NameAndType        #11:#12        // "<init>":()V
  #14 = Methodref          #4.#13         // java/lang/Object."<init>":()V
  #15 = Utf8               main
  #16 = Utf8               ([Ljava/lang/String;)V
  #17 = Utf8               java/lang/System
  #18 = Class              #17            // java/lang/System
  #19 = Utf8               currentTimeMillis
  #20 = Utf8               ()J
  #21 = NameAndType        #19:#20        // currentTimeMillis:()J
  #22 = Methodref          #18.#21        // java/lang/System.currentTimeMillis:()J
  #23 = Utf8               java/lang/Long
  #24 = Class              #23            // java/lang/Long
  #25 = Utf8               valueOf
  #26 = Utf8               (J)Ljava/lang/Long;
  #27 = NameAndType        #25:#26        // valueOf:(J)Ljava/lang/Long;
  #28 = Methodref          #24.#27        // java/lang/Long.valueOf:(J)Ljava/lang/Long;
  #29 = Utf8               m1
  #30 = Utf8               (Ljava/lang/Long;)V
  #31 = NameAndType        #29:#30        // m1:(Ljava/lang/Long;)V
  #32 = Methodref          #2.#31         // npe.m1:(Ljava/lang/Long;)V
  #33 = Utf8               m2
  #34 = NameAndType        #33:#30        // m2:(Ljava/lang/Long;)V
  #35 = Methodref          #2.#34         // npe.m2:(Ljava/lang/Long;)V
  #36 = Utf8               catch.npe.m1_0:0
  #37 = String             #36            // catch.npe.m1_0:0
  #38 = Utf8               org/jboss/byteman/rule/Rule
  #39 = Class              #38            // org/jboss/byteman/rule/Rule
  #40 = Utf8               execute
  #41 = Utf8               (Ljava/lang/String;Ljava/lang/Object;[Ljava/lang/Object;)V
  #42 = NameAndType        #40:#41        // execute:(Ljava/lang/String;Ljava/lang/Object;[Ljava/lang/Object;)V
  #43 = Methodref          #39.#42        // org/jboss/byteman/rule/Rule.execute:(Ljava/lang/String;Ljava/lang/Object;[Ljava/lang/Object;)V
  #44 = Utf8               org/jboss/byteman/rule/exception/EarlyReturnException
  #45 = Class              #44            // org/jboss/byteman/rule/exception/EarlyReturnException
  #46 = Utf8               org/jboss/byteman/rule/exception/ThrowException
  #47 = Class              #46            // org/jboss/byteman/rule/exception/ThrowException
  #48 = Utf8               org/jboss/byteman/rule/exception/ExecuteException
  #49 = Class              #48            // org/jboss/byteman/rule/exception/ExecuteException
  #50 = Utf8               out
  #51 = Utf8               Ljava/io/PrintStream;
  #52 = NameAndType        #50:#51        // out:Ljava/io/PrintStream;
  #53 = Fieldref           #18.#52        // java/lang/System.out:Ljava/io/PrintStream;
  #54 = Utf8               l1 = u0001
  #55 = String             #54            // l1 = u0001
  #56 = Utf8               java/lang/invoke/StringConcatFactory
  #57 = Class              #56            // java/lang/invoke/StringConcatFactory
  #58 = Utf8               makeConcatWithConstants
  #59 = Utf8               (Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/String;[Ljava/lang/Object;)Ljava/lang/invoke/CallSite;
  #60 = NameAndType        #58:#59        // makeConcatWithConstants:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/String;[Ljava/lang/Object;)Ljava/lang/invoke/CallSite;
  #61 = Methodref          #57.#60        // java/lang/invoke/StringConcatFactory.makeConcatWithConstants:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/String;[Ljava/lang/Object;)Ljava/lang/invoke/CallSite;
  #62 = MethodHandle       6:#61          // REF_invokeStatic java/lang/invoke/StringConcatFactory.makeConcatWithConstants:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/String;[Ljava/lang/Object;)Ljava/lang/invoke/CallSite;
  #63 = Utf8               (Ljava/lang/Long;)Ljava/lang/String;
  #64 = NameAndType        #58:#63        // makeConcatWithConstants:(Ljava/lang/Long;)Ljava/lang/String;
  #65 = InvokeDynamic      #0:#64         // #0:makeConcatWithConstants:(Ljava/lang/Long;)Ljava/lang/String;
  #66 = Utf8               java/io/PrintStream
  #67 = Class              #66            // java/io/PrintStream
  #68 = Utf8               println
  #69 = Utf8               (Ljava/lang/String;)V
  #70 = NameAndType        #68:#69        // println:(Ljava/lang/String;)V
  #71 = Methodref          #67.#70        // java/io/PrintStream.println:(Ljava/lang/String;)V
  #72 = Utf8               caught ReturnException
  #73 = String             #72            // caught ReturnException
  #74 = Utf8               caught ThrowException
  #75 = String             #74            // caught ThrowException
  #76 = Utf8               getThrowable
  #77 = Utf8               ()Ljava/lang/Throwable;
  #78 = NameAndType        #76:#77        // getThrowable:()Ljava/lang/Throwable;
  #79 = Methodref          #47.#78        // org/jboss/byteman/rule/exception/ThrowException.getThrowable:()Ljava/lang/Throwable;
  #80 = Utf8               caught ExecuteException
  #81 = String             #80            // caught ExecuteException
  #82 = Utf8               catch.npe.m2_1:0
  #83 = String             #82            // catch.npe.m2_1:0
  #84 = Utf8               l2 new = u0001
  #85 = String             #84            // l2 new = u0001
  #86 = InvokeDynamic      #1:#64         // #1:makeConcatWithConstants:(Ljava/lang/Long;)Ljava/lang/String;
  #87 = Utf8               Code
  #88 = Utf8               LineNumberTable
  #89 = Utf8               StackMapTable
  #90 = Utf8               InnerClasses
  #91 = Utf8               SourceFile
  #92 = Utf8               BootstrapMethods
{
  public npe();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
         0: aload_0
         1: invokespecial #14                 // Method java/lang/Object."<init>":()V
         4: return
      LineNumberTable:
        line 3: 0

  public static void main(java.lang.String[]);
    descriptor: ([Ljava/lang/String;)V
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=2, locals=3, args_size=1
         0: invokestatic  #22                 // Method java/lang/System.currentTimeMillis:()J
         3: invokestatic  #28                 // Method java/lang/Long.valueOf:(J)Ljava/lang/Long;
         6: astore_1
         7: aconst_null
         8: astore_2
         9: aload_1
        10: invokestatic  #32                 // Method m1:(Ljava/lang/Long;)V
        13: aload_2
        14: invokestatic  #35                 // Method m2:(Ljava/lang/Long;)V
        17: return
      LineNumberTable:
        line 5: 0
        line 6: 7
        line 8: 9
        line 9: 13
        line 10: 17

  static void m1(java.lang.Long);
    descriptor: (Ljava/lang/Long;)V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=6, locals=1, args_size=1
         0: ldc           #37                 // String catch.npe.m1_0:0
         2: aconst_null
         3: iconst_1
         4: anewarray     #4                  // class java/lang/Object
         7: dup
         8: iconst_0
         9: aload_0
        10: aastore
        11: invokestatic  #43                 // Method org/jboss/byteman/rule/Rule.execute:(Ljava/lang/String;Ljava/lang/Object;[Ljava/lang/Object;)V
        14: getstatic     #53                 // Field java/lang/System.out:Ljava/io/PrintStream;
        17: aload_0
        18: invokedynamic #65,  0             // InvokeDynamic #0:makeConcatWithConstants:(Ljava/lang/Long;)Ljava/lang/String;
        23: invokevirtual #71                 // Method java/io/PrintStream.println:(Ljava/lang/String;)V
        26: return
        27: getstatic     #53                 // Field java/lang/System.out:Ljava/io/PrintStream;
        30: ldc           #73                 // String caught ReturnException
        32: invokevirtual #71                 // Method java/io/PrintStream.println:(Ljava/lang/String;)V
        35: pop
        36: return
        37: getstatic     #53                 // Field java/lang/System.out:Ljava/io/PrintStream;
        40: ldc           #75                 // String caught ThrowException
        42: invokevirtual #71                 // Method java/io/PrintStream.println:(Ljava/lang/String;)V
        45: invokevirtual #79                 // Method org/jboss/byteman/rule/exception/ThrowException.getThrowable:()Ljava/lang/Throwable;
        48: athrow
        49: getstatic     #53                 // Field java/lang/System.out:Ljava/io/PrintStream;
        52: ldc           #81                 // String caught ExecuteException
        54: invokevirtual #71                 // Method java/io/PrintStream.println:(Ljava/lang/String;)V
        57: athrow
      Exception table:
         from    to  target type
             0    14    27   Class org/jboss/byteman/rule/exception/EarlyReturnException
             0    14    37   Class org/jboss/byteman/rule/exception/ThrowException
             0    14    49   Class org/jboss/byteman/rule/exception/ExecuteException
      StackMapTable: number_of_entries = 3
        frame_type = 91 /* same_locals_1_stack_item */
          stack = [ class org/jboss/byteman/rule/exception/EarlyReturnException ]
        frame_type = 73 /* same_locals_1_stack_item */
          stack = [ class org/jboss/byteman/rule/exception/ThrowException ]
        frame_type = 75 /* same_locals_1_stack_item */
          stack = [ class org/jboss/byteman/rule/exception/ExecuteException ]
      LineNumberTable:
        line 14: 14
        line 15: 26

  static void m2(java.lang.Long);
    descriptor: (Ljava/lang/Long;)V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=6, locals=1, args_size=1
         0: ldc           #83                 // String catch.npe.m2_1:0
         2: aconst_null
         3: iconst_1
         4: anewarray     #4                  // class java/lang/Object
         7: dup
         8: iconst_0
         9: aload_0
        10: aastore
        11: invokestatic  #43                 // Method org/jboss/byteman/rule/Rule.execute:(Ljava/lang/String;Ljava/lang/Object;[Ljava/lang/Object;)V
        14: getstatic     #53                 // Field java/lang/System.out:Ljava/io/PrintStream;
        17: aload_0
        18: invokedynamic #86,  0             // InvokeDynamic #1:makeConcatWithConstants:(Ljava/lang/Long;)Ljava/lang/String;
        23: invokevirtual #71                 // Method java/io/PrintStream.println:(Ljava/lang/String;)V
        26: return
        27: getstatic     #53                 // Field java/lang/System.out:Ljava/io/PrintStream;
        30: ldc           #73                 // String caught ReturnException
        32: invokevirtual #71                 // Method java/io/PrintStream.println:(Ljava/lang/String;)V
        35: pop
        36: return
        37: getstatic     #53                 // Field java/lang/System.out:Ljava/io/PrintStream;
        40: ldc           #75                 // String caught ThrowException
        42: invokevirtual #71                 // Method java/io/PrintStream.println:(Ljava/lang/String;)V
        45: invokevirtual #79                 // Method org/jboss/byteman/rule/exception/ThrowException.getThrowable:()Ljava/lang/Throwable;
        48: athrow
        49: getstatic     #53                 // Field java/lang/System.out:Ljava/io/PrintStream;
        52: ldc           #81                 // String caught ExecuteException
        54: invokevirtual #71                 // Method java/io/PrintStream.println:(Ljava/lang/String;)V
        57: athrow
      Exception table:
         from    to  target type
             0    14    27   Class org/jboss/byteman/rule/exception/EarlyReturnException
             0    14    37   Class org/jboss/byteman/rule/exception/ThrowException
             0    14    49   Class org/jboss/byteman/rule/exception/ExecuteException
      StackMapTable: number_of_entries = 3
        frame_type = 91 /* same_locals_1_stack_item */
          stack = [ class org/jboss/byteman/rule/exception/EarlyReturnException ]
        frame_type = 73 /* same_locals_1_stack_item */
          stack = [ class org/jboss/byteman/rule/exception/ThrowException ]
        frame_type = 75 /* same_locals_1_stack_item */
          stack = [ class org/jboss/byteman/rule/exception/ExecuteException ]
      LineNumberTable:
        line 19: 14
        line 20: 26
}
InnerClasses:
  public static final #10= #7 of #9;      // Lookup=class java/lang/invoke/MethodHandles$Lookup of class java/lang/invoke/MethodHandles
SourceFile: "npe.java"
BootstrapMethods:
  0: #62 REF_invokeStatic java/lang/invoke/StringConcatFactory.makeConcatWithConstants:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/String;[Ljava/lang/Object;)Ljava/lang/invoke/CallSite;
    Method arguments:
      #55 l1 = u0001
  1: #62 REF_invokeStatic java/lang/invoke/StringConcatFactory.makeConcatWithConstants:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/String;[Ljava/lang/Object;)Ljava/lang/invoke/CallSite;
    Method arguments:
      #85 l2 new = u0001

Why NPE is generated ?
Seems when rule is invoked, it is trying to pass null to native long, instead of Long.

  • byteman

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Filed under: Kiến thức lập trình - @ 08:57

Thẻ:

Trang chủ Giới thiệu Sinh nhật bé trai Sinh nhật bé gái Tổ chức sự kiện Biểu diễn giải trí Dịch vụ khác Trang trí tiệc cưới Tổ chức khai trương Tư vấn dịch vụ Thư viện ảnh Tin tức - sự kiện Liên hệ Chú hề sinh nhật Trang trí YEAR END PARTY công ty Trang trí tất niên cuối năm Trang trí tất niên xu hướng mới nhất Trang trí sinh nhật bé trai Hải Đăng Trang trí sinh nhật bé Khánh Vân Trang trí sinh nhật Bích Ngân Trang trí sinh nhật bé Thanh Trang Thuê ông già Noel phát quà Biểu diễn xiếc khỉ Xiếc quay đĩa
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