[ISSUE 4254] Every utility class should be annotated with @UtilityClass as we are using lombok

[makarandg2510-a11y]

Closes #4254

Motivation

This fixes the issue#4254.

Modifications

This PR refactors all eligible utility classes across the EventMesh codebase to use Lombok's @UtilityClass annotation.

What does @UtilityClass do?

Lombok's @UtilityClass annotation automatically:

• Makes the class final (preventing subclassing)
• Generates a private no-arg constructor that throws UnsupportedOperationException (preventing instantiation)
• Requires all members to be static

This replaces the ad-hoc manual patterns found across the codebase (public final class, public abstract class, explicit private constructors) with a single idiomatic annotation.

Files Changed (31 files)

eventmesh-common

• utils/: AssertUtils, JsonUtils (+ removed duplicate import), JsonPathUtils, NetUtils, PropertiesUtils, RandomStringUtils, ConfigurationContextUtil, ThreadUtils, LogUtil (removed redundant public final)
• remote/payload/: PayloadUtil
• protocol/grpc/common/: EventMeshCloudEventUtils (abstract → @UtilityClass)

eventmesh-runtime

• util/: BannerUtil, EventMeshUtil, HttpRequestUtil, HttpResponseUtils, RemotingHelper (abstract → @UtilityClass)
• core/protocol/grpc/service/: ServiceUtils

eventmesh-runtime-v2

• util/: BannerUtil, RuntimeUtils

eventmesh-openconnect

• util/: CloudEventUtil, ConfigUtil

eventmesh-connectors

• connector-http/util/: HttpUtils
• connector-jdbc/utils/: Antlr4Utils, ByteArrayUtils, JdbcStringUtils, MysqlUtils
• connector-rabbitmq/utils/: ByteArrayUtils
• connector-mongodb/utils/: MongodbCloudEventUtil
• connector-lark/: ConfigUtils

eventmesh-admin-server

• web/utils/: Base64Utils, EncryptUtil, JdbcUtils, RSAUtils (explicit private constructor removed)

Skipped (not eligible)

Class | Reason -- | -- SystemUtils | Uses static initializer blocks; @UtilityClass conflicts with its class-load initialisation IPUtils | Has mutable static field (localAddress) initialised via init(); not a pure utility HttpConvertsUtils | References non-static inner class constructs

Testing

• ./gradlew :eventmesh-common:compileJava ✅ — zero errors
• ./gradlew :eventmesh-runtime:compileJava ✅ — zero errors
• ./gradlew :eventmesh-admin-server:compileJava ✅ — zero errors
• ./gradlew :eventmesh-openconnect:eventmesh-openconnect-java:compileJava ✅ — zero errors
• All connector modules compile cleanly ✅

Documentation

• Does this pull request introduce a new feature? (yes / no) : no
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented) : not applicable
• If a feature is not applicable for documentation, explain why?: its a small update to existing classes.
• If a feature is not documented yet in this PR, please create a followup issue for adding the documentation

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