Java agent v8.20.0

Download this agent version

New features and improvements

Support for CRaC 2250
Support for JDK24 2284
Added sampling options when an inbound traceparent exists 2279
- These options define how the agent should handle sampling of spans, depending on sampling decisions that were made for their parent span by an upstream entity. The configuration options remote_parent_sampled and remote_parent_not_sampled specify what to do in the case the parent span was sampled or not sampled, respectively. See the documentation for full configuration details.
Support for Undertow as a stand-alone module 2269
- This instrumentation is disabled by default to avoid conflicts with existing Wildfly instrumentation. To enable this instrumentation for stand-alone Undertow server apps, use the configuration setting:
```
class_transformer:
   com.newrelic.instrumentation.undertow-server-1.1.0:
     enabled: true
```
Support for Couchbase Client 2203
- If the Couchbase Client Experimental Module is currently in use, remove it from your extensions directory before upgrading to this version of the Java Agent.

Fixes

Fix netty 'Unknown' transactions 2274
- This fix moves previous netty instrumentation changes behind a feature flag, which provides additional visibility in some cases involving HTTP2 transactions. To reenable this granularity (at the possible cost of seeing ‘Unknown’ transactions), use the config setting:
```
netty:
    http2:
      frame_read_listener:
        start_transaction: true
```
Refactor AWS docker id fetch to use 5s timeout 2275
Feature flag to apply Kotlin ArrayIndexOutOfBoundsException fix to all methods 2307
- This fix addresses errors that may be seen when running the Java Agent in an environment where Kotlin suspends functions are used. To use this fix, set the system property -Dnewrelic.config.class_transformer.clear_return_stacks=true
Prevent cache lock for long DB statement parsing 2294
Add config to specify whether java.sql is loaded by platform classloader 2267

Deprecations

The following instrumentation modules are deprecated and will be removed in the next major release:

aws-wrap-0.7.0
java.completable-future-jdk8
play-2.3
netty-3.4
Struts v1

Update to latest version

To identify which version of the Java agent you're currently using, run java -jar newrelic.jar -v. Your Java agent version will be printed to your console.

Then, to update to the latest Java agent version:

Back up the entire Java agent root directory to another location. Rename that directory to NewRelic_Agent#.#.#, where #.#.# is the agent version number.
Download the agent..
Unzip the new agent download file, then copy newrelic-api.jar and newrelic.jar into the original Java agent root directory.
Compare your old newrelic.yml with the newly downloaded newrelic.yml from the zip, and update the file if needed.
Restart your Java dispatcher.

If you experience issues after the Java agent update, restore from the backed-up New Relic agent directory.

Update agent config differences

We add new settings to newrelic.yml as we release new versions of the agent. You can use diff or another diffing utility to see what's changed, and add the new config settings to your old file. Make sure not to overwrite any customizations you've made to the file, such as your license key, app name, or changes to default settings.

For example, if you diff the default newrelic.yml files for Java agent versions 7.10.0 and 7.11.0, the results printed to the console will be like:

➜ diff newrelic_7.10.0.yml newrelic_7.11.0.yml
...
107a108,119
>       # Whether the log events should include context from loggers with support for that.
>       include_context_data:
>
>         # When true, application logs will contain context data.
>         enabled: false
>
>         # A comma separated list of attribute keys whose values should be sent to New Relic.
>         #include:
>
>         # A comma separated list of attribute keys whose values should not be sent to New Relic.
>         #exclude:
>
125a138
>
128c141
<     enabled: false
---
>     enabled: true
...

In this example, these lines were added to the default newrelic.yml in Java agent version 7.11.0. If you're moving to 7.11.0 or higher, you should add these new lines to your original newrelic.yml.

Support statement: