I have a custom application in which we have generated the Java Instruction code.We are generating the code using javacc. In one of the Scenarios, we are getting java.lang.verify error : Inconsistent stack height 1 != 2
I checked the generated class file as well as tried to decode the instruction set, but couldn't understand why i am getting this error. class: Test, method: runFunc signature: ()Ljava/lang/Object;) Inconsistent stack height 1 != 2
with detailed exception as
*java.lang.VerifyError: (class: Test, method: runFunc signature: ()Ljava/lang/Object;) Inconsistent stack height 1 != 2
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:2671)
at java.lang.Class.getConstructor0(Class.java:3075)
at java.lang.Class.getDeclaredConstructor(Class.java:2178)
I checked the generated class code and the runFunc Function is as shown below:
protected final Object runFunc() {
out = ((myPage) this).pageContext.getOut();
parent = ((myPage) this).parent;
((myPage) this).pageContext.setPageEncoding("test");
this.__tempIntertnalARRYSTRUCTVAR0.set(currentPage.StructNew());
__myapp_internal_sdref_ = Cast._Map(_autoscalarize(this.__tempIntertnalARRYSTRUCTVAR0));
__myapp_internal_sdref___restkeys = new ArrayList(4);
_setDref_Struct(null, __myapp_internal_sdref_, "a", false);
_set("rest", myPage._dreference_map_rest(__myapp_internal_sdref_, __myapp_internal_sdref___restkeys));
outVar = (printOutput) _initFunction(class$myApplication$ext$io$printOutput, 0, parent);
_setCurrentLineNo(41);
outVar.hasEndAttribute(true);
try {
if ((mode0 = outVar.doStart()) != 0)
do {
} while (outVar.doAfterBody() != 0);
if (outVar.doEnd() == 5) {
t8 = null;
outVar.doFinally();
return t8;
}
outVar.doFinally();
} catch (Throwable throwable) {
outVar.doCatch(throwable);
outVar.doFinally();
} catch (Throwable throwable) {
outVar.doFinally();
throw throwable;
}
_whitespace((Writer) out, "\r\n\r\n\r\n\r\n");
return null;
}
While the generated Instruction code for the same function obtained using javap utility looks as follows:
protected final java.lang.Object runFunc();
Code:
0:aload_0
1:getfield #40 // Field myApplication/runtime/myPage.pageContext:LmyApplication/runtime/AppPageContext;
4:invokevirtual #46 // Method javax/servlet/jsp/JspContext.getOut:()Ljavax/servlet/jsp/JspWriter;
7:astore_1
8:aload_0
9:getfield #50 // Field myApplication/runtime/myPage.parent:Ljavax/servlet/jsp/ext/Operation;
12:astore_3
13:aload_0
14:getfield #40 // Field myApplication/runtime/myPage.pageContext:LmyApplication/runtime/AppPageContext;
17:ldc #52 // String test
19:invokevirtual #58 // Method myApplication/runtime/AppPageContext.setPageEncoding:(Ljava/lang/String;)V
22:aload_0
23:getfield #33 // Field __tempIntertnalARRYSTRUCTVAR0:LmyApplication/runtime/Variable;
26:invokestatic #62 // Method myApplication/runtime/currentPage.StructNew:()Ljava/util/Map;
29:invokevirtual #68 // Method myApplication/runtime/Variable.set:(Ljava/lang/Object;)V
32:aload_0
33:aload_0
34:getfield #33 // Field __tempIntertnalARRYSTRUCTVAR0:LmyApplication/runtime/Variable;
37:invokevirtual #72 // Method myApplication/runtime/myPage._autoscalarize:(myApplication/runtime/Variable;)Ljava/lang/Object;
40:invokestatic #78 // Method myApplication/runtime/Cast._Map:(Ljava/lang/Object;)Ljava/util/Map;
43:astore 4
45:new #80 // class java/util/ArrayList
48:dup
49:iconst_4
50:invokespecial #83 // Method java/util/ArrayList."<init>":(I)V
53:astore 5
55:aload_0
56:aconst_null
57:aload 4
59:ldc #85 // String a
61:iconst_0
62:invokevirtual #89 // Method myApplication/runtime/myPage._setDref_Struct:(Ljava/lang/String;Ljava/util/Map;Ljava/lang/Object;Z)V
65:aload 5
67:ldc #85 // String a
69:invokeinterface #95,2 // InterfaceMethod java/util/List.add:(Ljava/lang/Object;)Z
74:aload_0
75:ldc #97 // String rest
77:aload 4
79:aload 5
81:invokestatic #101 // Method myApplication/runtime/myPage._dreference_map_rest:(Ljava/util/Map;Ljava/util/List;)Ljava/util/Map;
84:invokevirtual #105 // Method myApplication/runtime/myPage._set:(Ljava/lang/String;Ljava/lang/Object;)V
87:aload_0
88:getstatic #117 // Field class$myApplication$ext$io$printOutput:Ljava/lang/Class;
91:iconst_0
92:aload_3
93:invokevirtual #121 // Method myApplication/runtime/myPage._initFunction:(Ljava/lang/Class;ILjavax/servlet/jsp/ext/Operation;)Ljavax/servlet/jsp/ext/Operation;
96:checkcast #123 // class myApplication/ext/io/printOutput
99:astore 6
101:aload_0
102:bipush 41
104:invokevirtual #126 // Method myApplication/runtime/myPage._setCurrentLineNo:(I)V
107:aload 6
109:iconst_1
110:invokevirtual #132 // Method myApplication/ext/GenericOperation.hasEndAttribute:(Z)V
113:aload 6
115:invokevirtual #136 // Method myApplication/ext/io/printOutput.doStart:()I
118:dup
119:istore 7
121:ifeq 132
124:aload 6
126:invokevirtual #139 // Method myApplication/ext/io/printOutput.doAfterBody:()I
129:ifne 124
132:aload 6
134:invokevirtual #144 // Method myApplication/ext/QueryLoop.doEnd:()I
137:iconst_5
138:if_icmpne 150
141:aconst_null
142:astore 8
144:jsr 179
147:aload 8
149:areturn
150:jsr 179
153:goto 188
156:astore 9
158:aload 6
160:aload 9
162:invokevirtual #148 // Method myApplication/ext/QueryLoop.doCatch:(Ljava/lang/Throwable;)V
165:jsr 179
168:goto 188
171:astore 10
173:jsr 179
176:aload 10
178:athrow
179:astore 11
181:aload 6
183:invokevirtual #151 // Method myApplication/ext/io/printOutput.doFinally:()V
186:ret 11
188:aload_0
189:aload_1
190:ldc #153 // String \r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
192:invokevirtual #157 // Method myApplication/runtime/myPage._whitespace:(Ljava/io/Writer;Ljava/lang/String;)V
195:aconst_null
196:areturn
I would really appreciate if some-one can point me out as to where does the stack im balancing happens? Anticipating positive response, Thanks in Advance.