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  1.  Home
  2. RPG400-L
  3. January 2017

Re: ILERPG call to Java get list fails and generates core dump

(This is cross posted on java400-l)

With some advice from Jon ...

I have now generated all the prototypes using the Rdi wizard.

We have corrected the creation of the java calendar object and now can
convert the java object to a string and check the calendar values which
are now correct.

Two steps forward and then one step backwards.

We are now calling a class that returns a generic java object. The call
completes without error but the java object returned has a value of 0 and
any attempt to use that object fails.

Can a class that returns a generic object be used in RPG ?

I am also struggling to get any debug information from the java calls.
(Will open a pmr with IBM if I can't find any other way to get any
logging)

I have done the following but there is noting in the stdout or errout
files.

ADDENVVAR QIBM_RPG_JAVA_PROPERTIES

VALUE('-Dos400.stdout=file:/home/sttapp100r.txt;-Dos400.stderr=file:/home/sttapp100r.err.txt;')

ADDENVVAR QIBM_USE_DESCRIPTOR_STDIO VALUE('Y')

call CHECKSTDIO (This is the IBM documented program to open the output
files)
See:
http://www.ibm.com/developerworks/rational/cafe/docBodyAttachments/2681-102-2-7220/Troubleshooting_RPG_Calls_To_Java_v2.html#stdout

Cheers

Don


Don Brown

MSD Information Technology

Suite 5/29 McDougall Street Milton Q 4064
( 07 3368 7888
+ PO Box 1629 MILTON Q 4054
Ê 07 3368 7877
* Don.Brown@xxxxxxxxxx
È 0408 751 644
þ www.msd.net.au www.architect4web.com.au





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From: Scott Klement <rpg400-l@xxxxxxxxxxxxxxxx>
To: "RPG programming on the IBM i (AS/400 and iSeries)"
<rpg400-l@xxxxxxxxxxxx>
Date: 07/01/2017 09:04 AM
Subject: Re: ILERPG call to Java get list fails and generates core
dump
Sent by: "RPG400-L" <rpg400-l-bounces@xxxxxxxxxxxx>



Don,

Looks to me like you are doing the right thing in your example... I
misread the earlier message as saying that the class was java.util.List.
My mistake.

See, I knew I was asking a stupid question :-)

-SK



On 1/5/2017 4:45 PM, Don Brown wrote:
Forgive me but I am confused with your question and your question is
definitely not stupid.

My java skills are very, very poor and trial and error are my teacher.

I am trying to return an object into listIdJ using the method getIds on
java object result.

listIdJ = getIds(result);

The prototype for getIds is;

D getIds PR O ExtProc(*JAVA:
D 'com.braintreegateway.-
D ResourceCollection':'getIds')
D Class(*JAVA:'java.util.List')

So my understanding is for the ExtProc(*Java ... that you specify the
class as the first parameter and the method as the second.

From the results of;

javap -s com.braintreegateway.ResourceCollection

Compiled from "ResourceCollection.java"
public class com.braintreegateway.ResourceCollection extends
java.lang.Object implements java.lang.Iterable{
public
com.braintreegateway.ResourceCollection(com.braintreegateway.Pager,
com.braintreegateway.util.NodeWrapper);
Signature:
(Lcom/braintreegateway/Pager;Lcom/braintreegateway/util/NodeWrapper;)V
public int getMaximumSize();
Signature: ()I
public java.util.Iterator iterator();
Signature: ()Ljava/util/Iterator;
public java.lang.Object getFirst();
Signature: ()Ljava/lang/Object;
public java.util.List getIds();
Signature: ()Ljava/util/List;
static java.util.List
access$000(com.braintreegateway.ResourceCollection);
Signature: (Lcom/braintreegateway/ResourceCollection;)Ljava/util/List;

If I change the prototype as follows I get an error that the method is
not
found when I run the program;

D getIds PR O ExtProc(*JAVA:
D 'com.braintreegateway.-
D ResourceCollection':'getIds')
D Class(*java:'com.braintreegateway.-
D ResourceCollection')

I have defined the receiving java object (listIdJ) as follows;

D listIdJ S O Class(*JAVA:'java.util.List')


If I open the jar file in eclipse and expand the
com.braintreegateway.resourceCollection.class I can get the following
signature details.

// Compiled from ResourceCollection.java (version 1.5 : 49.0, super bit)
// Signature:
<T:Ljava/lang/Object;>Ljava/lang/Object;Ljava/lang/Iterable<TT;>;
public class com.braintreegateway.ResourceCollection implements
java.lang.Iterable {

// Field descriptor #22 Ljava/util/List;
// Signature: Ljava/util/List<Ljava/lang/String;>;
private java.util.List ids;

// Field descriptor #26 Lcom/braintreegateway/Pager;
// Signature: Lcom/braintreegateway/Pager<TT;>;
private com.braintreegateway.Pager pager;

// Field descriptor #29 I
private int pageSize;

// Method descriptor #31
(Lcom/braintreegateway/Pager;Lcom/braintreegateway/util/NodeWrapper;)V
// Signature:

(Lcom/braintreegateway/Pager<TT;>;Lcom/braintreegateway/util/NodeWrapper;)V
// Stack: 3, Locals: 3
public ResourceCollection(com.braintreegateway.Pager pager,
com.braintreegateway.util.NodeWrapper response);
0 aload_0 [this]
1 invokespecial java.lang.Object() [4]
4 aload_0 [this]
5 aload_1 [pager]
6 putfield com.braintreegateway.ResourceCollection.pager :
com.braintreegateway.Pager [1]
9 aload_0 [this]
10 aload_2 [response]
11 ldc <String "page-size"> [5]
13 invokevirtual
com.braintreegateway.util.NodeWrapper.findInteger(java.lang.String) :
java.lang.Integer [6]
16 invokevirtual java.lang.Integer.intValue() : int [7]
19 putfield com.braintreegateway.ResourceCollection.pageSize : int
[2]
22 aload_0 [this]
23 aload_2 [response]
24 ldc <String "ids/*"> [8]
26 invokevirtual
com.braintreegateway.util.NodeWrapper.findAllStrings(java.lang.String) :
java.util.List [9]
29 putfield com.braintreegateway.ResourceCollection.ids :
java.util.List [3]
32 return
Line numbers:
[pc: 0, line: 74]
[pc: 4, line: 75]
[pc: 9, line: 76]
[pc: 22, line: 77]
[pc: 32, line: 78]
Local variable table:
[pc: 0, pc: 33] local: this index: 0 type:
com.braintreegateway.ResourceCollection
[pc: 0, pc: 33] local: pager index: 1 type:
com.braintreegateway.Pager
[pc: 0, pc: 33] local: response index: 2 type:
com.braintreegateway.util.NodeWrapper
Local variable type table:
[pc: 0, pc: 33] local: this index: 0 type:
com.braintreegateway.ResourceCollection<T>
[pc: 0, pc: 33] local: pager index: 1 type:
com.braintreegateway.Pager<T>

// Method descriptor #43 ()I
// Stack: 1, Locals: 1
public int getMaximumSize();
0 aload_0 [this]
1 getfield com.braintreegateway.ResourceCollection.ids :
java.util.List [3]
4 invokeinterface java.util.List.size() : int [10] [nargs: 1]
9 ireturn
Line numbers:
[pc: 0, line: 86]
Local variable table:
[pc: 0, pc: 10] local: this index: 0 type:
com.braintreegateway.ResourceCollection
Local variable type table:
[pc: 0, pc: 10] local: this index: 0 type:
com.braintreegateway.ResourceCollection<T>

// Method descriptor #45 ()Ljava/util/Iterator;
// Signature: ()Ljava/util/Iterator<TT;>;
// Stack: 4, Locals: 1
public java.util.Iterator iterator();
0 new com.braintreegateway.ResourceCollection$PagedIterator [11]
3 dup
4 aload_0 [this]
5 aload_0 [this]
6 invokespecial

com.braintreegateway.ResourceCollection$PagedIterator(com.braintreegateway.ResourceCollection,
com.braintreegateway.ResourceCollection) [12]
9 areturn
Line numbers:
[pc: 0, line: 90]
Local variable table:
[pc: 0, pc: 10] local: this index: 0 type:
com.braintreegateway.ResourceCollection
Local variable type table:
[pc: 0, pc: 10] local: this index: 0 type:
com.braintreegateway.ResourceCollection<T>

// Method descriptor #48 ()Ljava/lang/Object;
// Signature: ()TT;
// Stack: 4, Locals: 1
public java.lang.Object getFirst();
0 aload_0 [this]
1 getfield com.braintreegateway.ResourceCollection.pager :
com.braintreegateway.Pager [1]
4 aload_0 [this]
5 getfield com.braintreegateway.ResourceCollection.ids :
java.util.List [3]
8 iconst_0
9 iconst_1
10 invokeinterface java.util.List.subList(int, int) :
java.util.List
[13] [nargs: 3]
15 invokeinterface
com.braintreegateway.Pager.getPage(java.util.List)
: java.util.List [14] [nargs: 2]
20 iconst_0
21 invokeinterface java.util.List.get(int) : java.lang.Object [15]
[nargs: 2]
26 areturn
Line numbers:
[pc: 0, line: 94]
Local variable table:
[pc: 0, pc: 27] local: this index: 0 type:
com.braintreegateway.ResourceCollection
Local variable type table:
[pc: 0, pc: 27] local: this index: 0 type:
com.braintreegateway.ResourceCollection<T>

// Method descriptor #51 ()Ljava/util/List;
// Signature: ()Ljava/util/List<Ljava/lang/String;>;
// Stack: 1, Locals: 1
public java.util.List getIds();
0 aload_0 [this]
1 getfield com.braintreegateway.ResourceCollection.ids :
java.util.List [3]
4 areturn
Line numbers:
[pc: 0, line: 98]
Local variable table:
[pc: 0, pc: 5] local: this index: 0 type:
com.braintreegateway.ResourceCollection
Local variable type table:
[pc: 0, pc: 5] local: this index: 0 type:
com.braintreegateway.ResourceCollection<T>

// Method descriptor #54
(Lcom/braintreegateway/ResourceCollection;)Ljava/util/List;
// Stack: 1, Locals: 1
static synthetic java.util.List
access$000(com.braintreegateway.ResourceCollection x0);
0 aload_0 [x0]
1 getfield com.braintreegateway.ResourceCollection.ids :
java.util.List [3]
4 areturn
Line numbers:
[pc: 0, line: 16]
Local variable table:
[pc: 0, pc: 5] local: x0 index: 0 type:
com.braintreegateway.ResourceCollection

// Method descriptor #57 (Lcom/braintreegateway/ResourceCollection;)I
// Stack: 1, Locals: 1
static synthetic int
access$100(com.braintreegateway.ResourceCollection
x0);
0 aload_0 [x0]
1 getfield com.braintreegateway.ResourceCollection.pageSize : int
[2]
4 ireturn
Line numbers:
[pc: 0, line: 16]
Local variable table:
[pc: 0, pc: 5] local: x0 index: 0 type:
com.braintreegateway.ResourceCollection

// Method descriptor #59
(Lcom/braintreegateway/ResourceCollection;)Lcom/braintreegateway/Pager;
// Stack: 1, Locals: 1
static synthetic com.braintreegateway.Pager
access$200(com.braintreegateway.ResourceCollection x0);
0 aload_0 [x0]
1 getfield com.braintreegateway.ResourceCollection.pager :
com.braintreegateway.Pager [1]
4 areturn
Line numbers:
[pc: 0, line: 16]
Local variable table:
[pc: 0, pc: 5] local: x0 index: 0 type:
com.braintreegateway.ResourceCollection

Inner classes:
[inner class info: #11
com/braintreegateway/ResourceCollection$PagedIterator, outer class info:
#16 com/braintreegateway/ResourceCollection
inner name: #19 PagedIterator, accessflags: 2 private]


Don Brown

MSD Information Technology

Suite 5/29 McDougall Street Milton Q 4064
( 07 3368 7888
+ PO Box 1629 MILTON Q 4054
Ê 07 3368 7877
* Don.Brown@xxxxxxxxxx
È 0408 751 644
þ www.msd.net.au www.architect4web.com.au





I am a proud supporter of THE REFERRAL NETWORK and recommend the
services
of the other member businesses. For more information please checkout the
website www.refnet.net.au





From: Scott Klement <rpg400-l@xxxxxxxxxxxxxxxx>
To: "RPG programming on the IBM i (AS/400 and iSeries)"
<rpg400-l@xxxxxxxxxxxx>
Date: 06/01/2017 07:32 AM
Subject: Re: ILERPG call to Java get list fails and generates
core
dump
Sent by: "RPG400-L" <rpg400-l-bounces@xxxxxxxxxxxx>



Don,

Forgive me if this is a stupid question, but... You told us the method
was "java.util.List getIds()". But you appear to be calling
"com.braintreegateway.ResourceCollection getIds()".

So... why don't these match? Is there more than one getIds() method?
If so, can you show us the signature et al for the braintree one so that
we can see the signature for the one you're trying to call?

-SK





On 1/5/2017 3:08 AM, Don Brown wrote:
I am hoping someone can point me in the right direction with this one.

Java is crashing when I use a method that should return a java list
object..

I checked the class using the javap -s command in qsh I get the details
about the class; (All class details from this are included below)

The method I am using is gstIds
public java.util.List getIds();
Signature: ()Ljava/util/List;

I have the prototype defined in my program as follows;

D getIds PR O ExtProc(*JAVA:
D 'com.braintreegateway.-
D ResourceCollection':'getIds')
D Class(*JAVA:'java.util.List')

D listIdJ S O Class(*JAVA:'java.util.List')

The following code snippet precedes the error but running in debug all
statements complete normally

// Create search request
transReqJ = transReqC();
dateParamsJ = dateParams(transReqJ);
transreqJ = setRange(dateParamsJ: startJ: endJ);
transGatewayJ = transGateway(gateway);

// Retrieve the transactions
result = search(transGatewayJ: transReqJ);

When the following line is executed it results in a gpf and system
dump.
There is a stack trace showing on the screen but is meaningless to me -
See below.

listIdJ = getIds(result);

The joblog shows error MSG:RNX0301 Java exception received when calling
Java method.
Cause . . . . . : RPG procedure STTAPP100R in program
XAPSW/STTAPP100R
received Java exception "**UNKNOWN ERROR**" when calling method
"getIds"

with signature "()Ljava.util.List;" in class
"com.braintreegateway.ResourceCollection".


Results from javap -s

javap -s com.braintreegateway.ResourceCollection

The java.version property was detected as input. This property is used
as
output only and has no effect on JVM initialization.
Compiled from "ResourceCollection.java"
public class com.braintreegateway.ResourceCollection extends
java.lang.Object implements java.lang.Iterable{
public
com.braintreegateway.ResourceCollection(com.braintreegateway.Pager,
com.braintreegateway.util.NodeWrapper);
Signature:
(Lcom/braintreegateway/Pager;Lcom/braintreegateway/util/NodeWrapper;)V

public int getMaximumSize();
Signature: ()I
public java.util.Iterator iterator();
Signature: ()Ljava/util/Iterator;
public java.lang.Object getFirst();
Signature: ()Ljava/lang/Object;
public java.util.List getIds();
Signature: ()Ljava/util/List;
static java.util.List
access$000(com.braintreegateway.ResourceCollection);

Signature:
(Lcom/braintreegateway/ResourceCollection;)Ljava/util/List;


Stack Trace from screen when error occurs

----------- Stack Backtrace -----------
gpProtectedRunCallInMethod+0x24 (0xD07F3BC0 [libj9vm24.so+0x15bc0])
signalProtectAndRunGlue+0x14 (0xD080F090 [libj9vm24.so+0x31090])
j9sig_protect+0x138 (0xD0872F54 [libj9prt24.so+0x1f54])
gpProtectAndRun+0xc4 (0xD080F19C [libj9vm24.so+0x3119c])
gpCheckCallin+0x44 (0xD07F4398 [libj9vm24.so+0x16398])
callVirtualObjectMethodA+0x38 (0xD07F8538 [libj9vm24.so+0x1a538])
J9_i5OS_CallObjectMethodA+0xac (0xD054C8B0 [libi5osenv.so+0xd8b0])
(0x000036F0)


Don Brown


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