[aspectj-users] AJDT weaving Null Pointer Exception

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[aspectj-users] AJDT weaving Null Pointer Exception

From: "Jeff Dalton" <daltonj@xxxxxxxxx>
Date: Wed, 4 Feb 2004 19:11:42 -0500
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Ok, here is what I am trying to do... I am working on refactoring Apache Cocoon 2.1. I am using an aspect to make my class, AbstractServerPage implement an interface, CacheableProcessingComponent. This also means introducing two methods, getValidity() and generateKey() required for the interface.

I have tried weaving two ways:

1) I weave using a build list including my aspect and the package I am modifying. I run the build on this and recieve the null pointer exception below.

2) Weaving the entire project/Application. The project weave completes, but I have two new errors. They are both from classes that are subclasses of AbstractServerPage, for example:

JSGenerator which extends XSPGenerator which extends AbstractServerPage. However, XSPGenerator does not have a build error in it and so I am a bit puzzled as to why JSGenerator has an error while XSPGenerator doesn't. Any suggestions?

Null Pointer exception from weaving mentioned in (1):

nts.language.generator.CompiledComponent, org.apache.avalon.framework.component.
Recomposable, org.apache.cocoon.caching.CacheableProcessingComponent:
protected long dateCreated
protected java.io.File[] dependencies
public void <init>():
                    ALOAD_0     // org.apache.cocoon.generation.AbstractServerPa
ge this   (line 77)
                    INVOKESPECIAL org.apache.cocoon.generation.ServletGenerator.
<init> ()V
    constructor-execution(void org.apache.cocoon.generation.AbstractServerPage.<
init>())
    |               ALOAD_0     // org.apache.cocoon.generation.AbstractServerPa
ge this   (line 95)
    |               LDC2_W -1
    | field-set(long org.apache.cocoon.generation.AbstractServerPage.dateCreated
)
    | |             PUTFIELD org.apache.cocoon.generation.AbstractServerPage.dat
eCreated J
    | field-set(long org.apache.cocoon.generation.AbstractServerPage.dateCreated
)
    |               ALOAD_0     // org.apache.cocoon.generation.AbstractServerPa
ge this   (line 97)
    |               ACONST_NULL
    | field-set(java.io.File[] org.apache.cocoon.generation.AbstractServerPage.d
ependencies)
    | |             PUTFIELD org.apache.cocoon.generation.AbstractServerPage.dep
endencies [Ljava/io/File;
    | field-set(java.io.File[] org.apache.cocoon.generation.AbstractServerPage.d
ependencies)
    |               RETURN   (line 77)
    constructor-execution(void org.apache.cocoon.generation.AbstractServerPage.<
init>())
end public void <init>()

public void recompose(org.apache.avalon.framework.component.ComponentManager)
throws org.apache.avalon.framework.component.ComponentException:
    method-execution(void org.apache.cocoon.generation.AbstractServerPage.recomp
ose(org.apache.avalon.framework.component.ComponentManager))
    |               ALOAD_0     // org.apache.cocoon.generation.AbstractServerPa
ge this   (line 104)
    |               ALOAD_1     // org.apache.avalon.framework.component.Compone
ntManager manager
    | field-set(org.apache.avalon.framework.component.ComponentManager org.apach
e.cocoon.generation.ComposerGenerator.manager)
    | |             PUTFIELD org.apache.cocoon.generation.ComposerGenerator.mana
ger Lorg/apache/avalon/framework/component/ComponentManager;
    | field-set(org.apache.avalon.framework.component.ComponentManager org.apach
e.cocoon.generation.ComposerGenerator.manager)
    |               RETURN   (line 105)
    method-execution(void org.apache.cocoon.generation.AbstractServerPage.recomp
ose(org.apache.avalon.framework.component.ComponentManager))
end public void recompose(org.apache.avalon.framework.component.ComponentManag
er) throws org.apache.avalon.framework.component.ComponentException

public boolean modifiedSince(long):
    method-execution(boolean org.apache.cocoon.generation.AbstractServerPage.mod
ifiedSince(long))
    |               LLOAD_1     // long arg0   (line 114)
    |               LCONST_0
    |               LCMP
    |               IFEQ L0
    |               ALOAD_0     // org.apache.cocoon.generation.AbstractServerPa
ge this
    | field-get(long org.apache.cocoon.generation.AbstractServerPage.dateCreated
)
    | |             GETFIELD org.apache.cocoon.generation.AbstractServerPage.dat
eCreated J
    | field-get(long org.apache.cocoon.generation.AbstractServerPage.dateCreated
)
    |               LLOAD_1     // long arg0
    |               LCMP
    |               IFGE L1
    |           L0: ICONST_1   (line 115)
    |               IRETURN
    |           L1: ICONST_0   (line 118)
    |               ISTORE_3
    |               GOTO L4
    |           L2: ALOAD_0     // org.apache.cocoon.generation.AbstractServerPa
ge this   (line 119)
    | field-get(long org.apache.cocoon.generation.AbstractServerPage.dateCreated
)
    | |             GETFIELD org.apache.cocoon.generation.AbstractServerPage.dat
eCreated J
    | field-get(long org.apache.cocoon.generation.AbstractServerPage.dateCreated
)
    |               ALOAD_0     // org.apache.cocoon.generation.AbstractServerPa
ge this
    | field-get(java.io.File[] org.apache.cocoon.generation.AbstractServerPage.d
ependencies)
    | |             GETFIELD org.apache.cocoon.generation.AbstractServerPage.dep
endencies [Ljava/io/File;
    | field-get(java.io.File[] org.apache.cocoon.generation.AbstractServerPage.d
ependencies)
    |               ILOAD_3     // int i
    |               AALOAD
    | method-call(long java.io.File.lastModified())
    | |             INVOKEVIRTUAL java.io.File.lastModified ()J
    | method-call(long java.io.File.lastModified())
    |               LCMP
    |               IFGE L3
    |               ICONST_1   (line 120)
    |               IRETURN
    |           L3: IINC 3 1     // int i   (line 118)
    |           L4: ILOAD_3     // int i
    |               ALOAD_0     // org.apache.cocoon.generation.AbstractServerPa
ge this
    | field-get(java.io.File[] org.apache.cocoon.generation.AbstractServerPage.d
ependencies)
    | |             GETFIELD org.apache.cocoon.generation.AbstractServerPage.dep
endencies [Ljava/io/File;
    | field-get(java.io.File[] org.apache.cocoon.generation.AbstractServerPage.d
ependencies)
    |               ARRAYLENGTH
    |               IF_ICMPLT L2
    |               ICONST_0   (line 124)
    |               IRETURN
    method-execution(boolean org.apache.cocoon.generation.AbstractServerPage.mod
ifiedSince(long))
end public boolean modifiedSince(long)

public boolean hasContentChanged(org.apache.cocoon.environment.Request):
    method-execution(boolean org.apache.cocoon.generation.AbstractServerPage.has
ContentChanged(org.apache.cocoon.environment.Request))
    |               ICONST_1   (line 138)
    |               IRETURN
    method-execution(boolean org.apache.cocoon.generation.AbstractServerPage.has
ContentChanged(org.apache.cocoon.environment.Request))
end public boolean hasContentChanged(org.apache.cocoon.environment.Request)

protected void attribute(org.xml.sax.helpers.AttributesImpl, String, String):
    method-execution(void org.apache.cocoon.generation.AbstractServerPage.attrib
ute(org.xml.sax.helpers.AttributesImpl, java.lang.String, java.lang.String))
    |               ALOAD_1     // org.xml.sax.helpers.AttributesImpl attr   (li
ne 177)
    |               LDC ""
    |               ALOAD_2     // java.lang.String arg1
    |               ALOAD_2     // java.lang.String arg1
    |               LDC "CDATA"
    |               ALOAD_3     // java.lang.String arg2
    | method-call(void org.xml.sax.helpers.AttributesImpl.addAttribute(java.lang
.String, java.lang.String, java.lang.String, java.lang.String, java.lang.String)
)
    | |             INVOKEVIRTUAL org.xml.sax.helpers.AttributesImpl.addAttribut
e (Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava
/lang/String;)V
    | method-call(void org.xml.sax.helpers.AttributesImpl.addAttribute(java.lang
.String, java.lang.String, java.lang.String, java.lang.String, java.lang.String)
)
    |               RETURN   (line 178)
    method-execution(void org.apache.cocoon.generation.AbstractServerPage.attrib
ute(org.xml.sax.helpers.AttributesImpl, java.lang.String, java.lang.String))
end protected void attribute(org.xml.sax.helpers.AttributesImpl, String, Strin
g)

protected void start(String, org.xml.sax.helpers.AttributesImpl) throws org.xm
l.sax.SAXException:
    method-execution(void org.apache.cocoon.generation.AbstractServerPage.start(
java.lang.String, org.xml.sax.helpers.AttributesImpl))
    |               ALOAD_0     // org.apache.cocoon.generation.AbstractServerPa
ge this   (line 187)
    | field-get(org.xml.sax.ContentHandler org.apache.cocoon.xml.AbstractXMLProd
ucer.contentHandler)
    | |             GETFIELD org.apache.cocoon.xml.AbstractXMLProducer.contentHa
ndler Lorg/xml/sax/ContentHandler;
    | field-get(org.xml.sax.ContentHandler org.apache.cocoon.xml.AbstractXMLProd
ucer.contentHandler)
    |               LDC ""
    |               ALOAD_1     // java.lang.String name
    |               ALOAD_1     // java.lang.String name
    |               ALOAD_2     // org.xml.sax.helpers.AttributesImpl arg1
    | method-call(void org.xml.sax.ContentHandler.startElement(java.lang.String,
java.lang.String, java.lang.String, org.xml.sax.Attributes))
    | |             INVOKEINTERFACE org.xml.sax.ContentHandler.startElement (Lja
va/lang/String;Ljava/lang/String;Ljava/lang/String;Lorg/xml/sax/Attributes;)V
    | method-call(void org.xml.sax.ContentHandler.startElement(java.lang.String,
java.lang.String, java.lang.String, org.xml.sax.Attributes))
    |               ALOAD_2     // org.xml.sax.helpers.AttributesImpl arg1   (li
ne 188)
    | method-call(void org.xml.sax.helpers.AttributesImpl.clear())
    | |             INVOKEVIRTUAL org.xml.sax.helpers.AttributesImpl.clear ()V
    | method-call(void org.xml.sax.helpers.AttributesImpl.clear())
    |               RETURN   (line 189)
    method-execution(void org.apache.cocoon.generation.AbstractServerPage.start(
java.lang.String, org.xml.sax.helpers.AttributesImpl))
end protected void start(String, org.xml.sax.helpers.AttributesImpl) throws or
g.xml.sax.SAXException

protected void end(String) throws org.xml.sax.SAXException:
    method-execution(void org.apache.cocoon.generation.AbstractServerPage.end(ja
va.lang.String))
    |               ALOAD_0     // org.apache.cocoon.generation.AbstractServerPa
ge this   (line 197)
    | field-get(org.xml.sax.ContentHandler org.apache.cocoon.xml.AbstractXMLProd
ucer.contentHandler)
    | |             GETFIELD org.apache.cocoon.xml.AbstractXMLProducer.contentHa
ndler Lorg/xml/sax/ContentHandler;
    | field-get(org.xml.sax.ContentHandler org.apache.cocoon.xml.AbstractXMLProd
ucer.contentHandler)
    |               LDC ""
    |               ALOAD_1     // java.lang.String arg0
    |               ALOAD_1     // java.lang.String arg0
    | method-call(void org.xml.sax.ContentHandler.endElement(java.lang.String, j
ava.lang.String, java.lang.String))
    | |             INVOKEINTERFACE org.xml.sax.ContentHandler.endElement (Ljava
/lang/String;Ljava/lang/String;Ljava/lang/String;)V
    | method-call(void org.xml.sax.ContentHandler.endElement(java.lang.String, j
ava.lang.String, java.lang.String))
    |               RETURN   (line 198)
    method-execution(void org.apache.cocoon.generation.AbstractServerPage.end(ja
va.lang.String))
end protected void end(String) throws org.xml.sax.SAXException

protected void characters(String) throws org.xml.sax.SAXException:
    method-execution(void org.apache.cocoon.generation.AbstractServerPage.charac
ters(java.lang.String))
    |               ALOAD_0     // org.apache.cocoon.generation.AbstractServerPa
ge this   (line 206)
    | field-get(org.xml.sax.ContentHandler org.apache.cocoon.xml.AbstractXMLProd
ucer.contentHandler)
    | |             GETFIELD org.apache.cocoon.xml.AbstractXMLProducer.contentHa
ndler Lorg/xml/sax/ContentHandler;
    | field-get(org.xml.sax.ContentHandler org.apache.cocoon.xml.AbstractXMLProd
ucer.contentHandler)
    |               ALOAD_1     // java.lang.String arg0
    | method-call(char[] java.lang.String.toCharArray())
    | |             INVOKEVIRTUAL java.lang.String.toCharArray ()[C
    | method-call(char[] java.lang.String.toCharArray())
    |               ICONST_0
    |               ALOAD_1     // java.lang.String arg0
    | method-call(int java.lang.String.length())
    | |             INVOKEVIRTUAL java.lang.String.length ()I
    | method-call(int java.lang.String.length())
    | method-call(void org.xml.sax.ContentHandler.characters(char[], int, int))
    | |             INVOKEINTERFACE org.xml.sax.ContentHandler.characters ([CII)
V
    | method-call(void org.xml.sax.ContentHandler.characters(char[], int, int))
    |               RETURN   (line 207)
    method-execution(void org.apache.cocoon.generation.AbstractServerPage.charac
ters(java.lang.String))
end protected void characters(String) throws org.xml.sax.SAXException

protected void comment(String) throws org.xml.sax.SAXException:
    method-execution(void org.apache.cocoon.generation.AbstractServerPage.comment(java.lang.String))
    |               ALOAD_0     // org.apache.cocoon.generation.AbstractServerPage this   (line 215)
    | field-get(org.xml.sax.ext.LexicalHandler org.apache.cocoon.xml.AbstractXMLProducer.lexicalHandler)
    | |             GETFIELD org.apache.cocoon.xml.AbstractXMLProducer.lexicalHandler Lorg/xml/sax/ext/LexicalHandler;
    | field-get(org.xml.sax.ext.LexicalHandler org.apache.cocoon.xml.AbstractXMLProducer.lexicalHandler)
    |               ALOAD_1     // java.lang.String arg0
    | method-call(char[] java.lang.String.toCharArray())
    | |             INVOKEVIRTUAL java.lang.String.toCharArray ()[C
    | method-call(char[] java.lang.String.toCharArray())
    |               ICONST_0
    |               ALOAD_1     // java.lang.String arg0
    | method-call(int java.lang.String.length())
    | |             INVOKEVIRTUAL java.lang.String.length ()I
    | method-call(int java.lang.String.length())
    | method-call(void org.xml.sax.ext.LexicalHandler.comment(char[], int, int))

| | INVOKEINTERFACE org.xml.sax.ext.LexicalHandler.comment ([CII)V
| method-call(void org.xml.sax.ext.LexicalHandler.comment(char[], int, int))

| RETURN (line 216)
method-execution(void org.apache.cocoon.generation.AbstractServerPage.comment(java.lang.String))
end protected void comment(String) throws org.xml.sax.SAXException

end public abstract class org.apache.cocoon.generation.AbstractServerPage
null
java.lang.NullPointerException
        at org.aspectj.weaver.AsmRelationshipProvider.checkerMunger(AsmRelationshipProvider.java:51)
        at org.aspectj.weaver.Checker.match(Checker.java:58)
        at org.aspectj.weaver.bcel.BcelClassWeaver.match(BcelClassWeaver.java:985)
        at org.aspectj.weaver.bcel.BcelClassWeaver.match(BcelClassWeaver.java:791)
        at org.aspectj.weaver.bcel.BcelClassWeaver.weave(BcelClassWeaver.java:291)
        at org.aspectj.weaver.bcel.BcelClassWeaver.weave(BcelClassWeaver.java:77)
        at org.aspectj.weaver.bcel.BcelWeaver.weave(BcelWeaver.java:417)
        at org.aspectj.weaver.bcel.BcelWeaver.weave(BcelWeaver.java:390)
        at org.aspectj.weaver.bcel.BcelWeaver.weave(BcelWeaver.java:327)
        at org.aspectj.ajdt.internal.core.builder.AjBuildManager.weaveAndGenerateClassFiles(AjBuildManager.java:256)
        at org.aspectj.ajdt.internal.core.builder.AjBuildManager.doBuild(AjBuildManager.java:156)
        at org.aspectj.ajdt.internal.core.builder.AjBuildManager.batchBuild(AjBuildManager.java:70)
        at org.aspectj.ajde.internal.CompilerAdapter.compile(CompilerAdapter.java:103)
        at org.aspectj.ajde.internal.AspectJBuildManager$CompilerThread.run(AspectJBuildManager.java:165)

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