When does org.apache.sling.api.scripting.SlingScriptHelper.getService(Class) returns null? VerifyError: Expecting a stackmap frame

Question

According this documentation link:

SlingScriptHelper.getService returns null if service is not availibale.

Can you explain conditions when service is unavailble and how to force it to become availible ?

edit:

components view: enter image description here

relevant log:

22.09.2014 19:13:17.077 *ERROR* [FelixStartLevel] ****** bind method [bindResolverFactory] not found; Component will fail
22.09.2014 19:13:17.078 *ERROR* [FelixStartLevel] ****** Error during instantiation of the implementation object (java.lang.VerifyError: Expecting a stackmap frame at branch target 13
Exception Details:
  Location:
    *******.unbindConfigurator(L********Configurator;)V @5: if_acmpne
  Reason:
    Expected stackmap frame at this location.
  Bytecode:
    0000000: 2ab4 0086 2ba6 0008 2a01 b500 86b1     
) java.lang.VerifyError: Expecting a stackmap frame at branch target 13
Exception Details:
  Location:
    *****.unbindConfigurator(L*****;)V @5: if_acmpne
  Reason:
    Expected stackmap frame at this location.
  Bytecode:
    0000000: 2ab4 0086 2ba6 0008 2a01 b500 86b1

Check the following links which seems to address similar problems. http://stackoverflow.com/questions/25982555/cq5-sling-servlet-with-querybuilder and http://stackoverflow.com/questions/22259579/how-do-i-add-the-command-xx-usesplitverifier-to-an-osgi-bundle-built-in-crxde-l — rakhi4110, Sep 23 '14 at 04:58
@rakhi4110 looks like this: https://issues.apache.org/jira/browse/FELIX-3568 — gstackoverflow, Sep 23 '14 at 07:31

Thomas · Answer 1 · 2014-09-22T15:11:22.347

0

I see a few reasons when a service might not be available:

The Bundle implementing the service interface isn't deployed
The Bundle is deployed but cannot be started (usually some dependency is missing)
The Component could not be started because the activate method threw an exception

You can check 1 and 2 in the OSGi Console, for 3 you'll need to check the logs. To fix it, 1 is obvious, install the bundle. For 2 you need to check what dependency can not be resolved, then you need to check if the bundle exporting the dependency is running. For 3 it may be a problem in the code or an invalid configuration or a referenced service isn't availabl, which could again be any of the three reasons.

edited Sep 22 '14 at 15:11

answered Sep 22 '14 at 14:58

Thomas

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1-2. Bundle in which service was defined - active – gstackoverflow Sep 22 '14 at 15:00
3 - component unsatisfied – gstackoverflow Sep 22 '14 at 15:02
Then you have to check the logs or even try to debug the activate method to see why it cannot be activated. – Thomas Sep 22 '14 at 15:03
service class have not activate method – gstackoverflow Sep 22 '14 at 15:08
I changed my answer a bit, I accidentally put the solution for 3 into 2 in the initial post. So you'll need to check why it is unsatisfied, which could be a referenced service which isn't available – Thomas Sep 22 '14 at 15:12
all references satisfied: http://cdn.joxi.ru/uploads/prod/2014/09/22/264/834/810b45982d4d65125803a512bb4cf2faec60fb1d.jpg – gstackoverflow Sep 22 '14 at 15:17
I'm running out of ideas, so last resort is to restart the instance and see if the component is happy afterwards. – Thomas Sep 22 '14 at 15:21
Unfortunately it didn't help( This problem arose after migration from cq 5.5 to cq 5.6.1 – gstackoverflow Sep 22 '14 at 15:24
in logs: bindResolverFactory cannot be found (java.lang.VerifyError: Expecting a stackmap frame at branch target 13....bytecode cpmpatibility problem... – gstackoverflow Sep 22 '14 at 15:29
Might be because it was compiled with a lower version of Java and then trying to run it on a higher version. Not exactly sure though. – rakhi4110 Sep 22 '14 at 15:45
I use same java 7 for compiling and executing – gstackoverflow Sep 22 '14 at 15:50

score 0 · Answer 2 · answered Sep 29 '14 at 13:00

0

It looks like a java compatibility issue. Java 7 introduce new validation for the class file. If the method are generated at runtime via bytecode that could cause issue if the bytecode version does not match.

which version of cq are you running? which version of java are you compiling for? you can try compiling with a java 6 target.

answered Sep 29 '14 at 13:00

user3996996

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cq 5.6.1. I compile with java 7. I didn't understand this: **you can try compiling with a java 6 target** – gstackoverflow Sep 29 '14 at 13:59
you can specify for which bytecode version you are compiling the code. If the bytecode generator try to match the version of the bytecode it's trying to instrument then it will solve it. If you use maven you need to configure the compiler plugin org.apache.maven.plugins maven-compiler-plugin 3.1 1.6 1.6 – user3996996 Sep 30 '14 at 14:55

When does org.apache.sling.api.scripting.SlingScriptHelper.getService(Class) returns null? VerifyError: Expecting a stackmap frame

2 Answers2