Bugfix to parse correctly Java options when the environment variable LS_JAVA_OPTS contains multiple definitions separated by space character.
Adapt the parsing of `LS_JAVA_OPTS` environment variable to split by space various definitions it can contains.
Adds a global new task named javaTests which groups both :logstash-core:javaTests and :jvm-options-parser:test to include the JvmOptionParser unit test in javaTests phase.
Updates Netty's configuration of maxOrder to a previously proven value, if not already customised by the user.
Adds a step to the JvmOption parsing tool, which is used to compose the JVM options string to pass down to Logstash at startup.
The added step rework the parsed options to set the allocator max order -Dio.netty.allocator.maxOrder=11 so that the maximum pooled buffer is up to 16MB and not 4MB.
This option is added iff it's not yet specified by the user
With JDK 18, the Javac lint checking was expanded to raise an error on serializable subclasses that contains instance fields which are not serializable themselves.
This could be solved suppressing the warning or marking the field as transient. The majority of classes with this problem inherit transitively from Serializable but are not intended to be serialized (from Java's serialization mechanism) because has the serialVersionUID = 1L which is just a fix to make linter happy, but are not effectively used in a serialization context.
This commit also removes a finalize method, that could be safely be removed.
This commit moves the JvmOptionParser into its own gradle project.
This enables the JvmOptionParser to remain compatible with Java 1.8 to present a helpful error message to a user attempting to start Logstash using older versions of Java, while allowing the main Logstash code base to freely use idiomatic Java 11 features.
