hypr2771 opened a new pull request, #496:
URL: https://github.com/apache/felix-dev/pull/496
## Context
Had the following issue during my switch from Jackson 2 to 3:
- my Felix container was upgraded in version 3
- my bundles were still using version 2
- they instantiated some modules
- which were provided by the container
- these modules did not have any namespace change
- so classes were still existing
- but these classes were not usable by Jackson 2
It was really not straightforward to debug due to the lack of logging on the
`org.apache.felix.scr.impl.manager.SingleComponentManager#getService(Bundle,
ServiceRegistration<S>)` method, and particularly since it caches the result.
<details>
<summary>View an example stack trace</summary>
```
ERROR : bundle my-plugin:2.1.0 (6)[my.plugin.path.MyPluginService(0)] :
Failed to create service from bundle
java.lang.VerifyError: Bad type on operand stack
Exception Details:
Location:
my/plugin/path.MyPluginService.<clinit>()V @68: invokevirtual
Reason:
Type 'io/vavr/jackson/datatype/VavrModule' (current frame, stack[1]) is
not assignable to 'com/fasterxml/jackson/databind/Module'
Current Frame:
bci: @68
flags: { }
locals: { }
stack: { 'com/fasterxml/jackson/databind/ObjectMapper',
'io/vavr/jackson/datatype/VavrModule' }
Bytecode:
0000000: bb01 c959 b702 a4b2 02aa 04b6 02ae b202
0000010: b403 b602 b7b2 02ba 03b6 02ae b202 beb6
0000020: 02c2 b202 c8b6 02cc bb02 ce59 b702 cfb6
0000030: 02d3 bb00 6959 bb00 6759 b702 d404 b602
0000040: d8b7 02db b602 d3b3 01b5 b1
at java.base/java.lang.Class.getDeclaredConstructors0(Native Method)
at
java.base/java.lang.Class.privateGetDeclaredConstructors(Class.java:2985)
at java.base/java.lang.Class.getConstructors(Class.java:2025)
at
org.apache.felix.scr.impl.inject.internal.ComponentConstructorImpl.<init>(ComponentConstructorImpl.java:98)
at
org.apache.felix.scr.impl.inject.internal.ComponentMethodsImpl.initComponentMethods(ComponentMethodsImpl.java:110)
at
org.apache.felix.scr.impl.manager.AbstractComponentManager.initDependencyManagers(AbstractComponentManager.java:1029)
at
org.apache.felix.scr.impl.manager.AbstractComponentManager.collectDependencies(AbstractComponentManager.java:1057)
at
org.apache.felix.scr.impl.manager.SingleComponentManager.getServiceInternal(SingleComponentManager.java:955)
```
## Goal
The goal of this PR is simply to add a log to let user know when a failure
occurs and why, so that he can be aware something wrong occurred and can know
the reason behind the linkage issue.
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