Update java language version to 11 (#3155)

https://issues.apache.org/jira/browse/TINKERPOP-3172

Drops support for Java 8 and sets the minimum language version to Java 11.

Author: Cole-Greer

.github/workflows/build-test.yml

@@ -46,20 +46,6 @@ jobs:
         uses: codecov/codecov-action@v5
         with:
          directory: ./gremlin-tools/gremlin-coverage/target/site
-  java-jdk8:
-    name: mvn clean install - jdk8
-    timeout-minutes: 45
-    needs: smoke
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - name: Set up JDK 8
-        uses: actions/setup-java@v4
-        with:
-          java-version: '8'
-          distribution: 'temurin'
-      - name: Build with Maven
-        run: mvn clean install -pl -:gremlin-javascript -Dci --batch-mode -Dorg.slf4j.simpleLogger.log.org.apache.maven.cli.transfer.Slf4jMavenTransferListener=warn
   gremlin-server-default:
     name: gremlin-server default
     timeout-minutes: 45

CHANGELOG.asciidoc

@@ -73,6 +73,7 @@ This release also includes changes from <<release-3-7-XXX, 3.7.XXX>>.
 * Deprecated `ProcessLimitedStandardSuite` and `ProcessLimitedComputerSuite` in favor of `ProcessEmbeddedStandardSuite` and `ProcessEmbeddedComputerSuite` respectively.
 * Deprecated `ProcessStandardSuite` and the `ProcessComputerSuite` in favor of Gherkin testing and the `ProcessEmbeddedStandardSuite` and `ProcessEmbeddedComputerSuite` for testing JVM-specific Gremlin behaviors.
 * Removed lambda oriented Gremlin testing from Gherkin test suite.
+* Increase minimum Java version from 1.8 to 11 for building and running.
 * Moved all lambda oriented Gremlin tests to `LambdaStepTest` in the Java test suite.
 * Removed the `@RemoteOnly` testing tag in Gherkin as lambda tests have all been moved to the Java test suite.
 * Updated gremlin-javascript to use GraphBinary as default instead of GraphSONv3

docker/Dockerfile

@@ -29,9 +29,7 @@ RUN apt-get install apt-transport-https gnupg ca-certificates
 RUN sh -c 'echo "deb https://download.mono-project.com/repo/ubuntu stable-focal main" | tee /etc/apt/sources.list.d/mono-official-stable.list'
 RUN apt-get update
 
-# include both java 8/11 so that we can use the same docker image for future builds on that version of the jdk as we do
-# for the older release branches. the java version to use is just controlled by JAVA_HOME hardcoded below
-RUN apt-get install -y openjdk-8-jdk openjdk-11-jdk gawk git maven openssh-server subversion zip
+RUN apt-get install -y openjdk-11-jdk gawk git maven openssh-server subversion zip
 RUN apt-get install -y --force-yes dotnet-sdk-8.0 mono-devel
 
 ENV DEBIAN_FRONTEND=noninteractive
@@ -45,7 +43,6 @@ RUN python3 -m pip install --upgrade pip
 RUN pip install virtualenv
 RUN pip install virtualenvwrapper --no-deps
 
-RUN rm -rf /var/lib/apt/lists/* /var/cache/openjdk-8-jdk
 RUN rm -rf /var/lib/apt/lists/* /var/cache/openjdk-11-jdk
 
 RUN sed -i 's@PermitRootLogin without-password@PermitRootLogin yes@' /etc/ssh/sshd_config

docs/site/home/download.html

@@ -329,7 +329,7 @@ <h2 class="ft-25 black bold mb-4">Archived Releases</h2>
                         <div class="d-flex mb-3 align-items-start">
                             <img src="img/download/information-circle-outline.svg" class="img-fluid me-2 pt-1" alt="img">
                             <div>
-                                Gremlin Console and Gremlin Server are compatible with Java 8/11.
+                                Gremlin Console and Gremlin Server are compatible with Java 11/17.
                             </div>
                         </div>
                         <div class="d-flex mb-3 align-items-start">

docs/src/dev/developer/development-environment.asciidoc

@@ -26,9 +26,7 @@ image:conspiracy.png[]
 [[system-configuration]]
 == System Configuration
 
-At a minimum, development of TinkerPop requires link:https://openjdk.java.net/projects/jdk8/[Java 8] but it is
-preferable to use link:https://openjdk.java.net/projects/jdk/11/[Java 11] cross-compiled to Java 8 (the
-cross-compilation happens automatically as part of the build). Starting with 3.7.0, you can also build with
+At a minimum, development of TinkerPop requires link:https://openjdk.java.net/projects/jdk/11/[Java 11]. Since 3.7.0, you can also build with
 link:https://openjdk.org/projects/jdk/17/[Java 17]. Note, however, that there are some issues with deep reflection
 so there are `--add-opens` JVM options included in the pom files to enable this to work. Maven (requiring a minimum of
 link:https://maven.apache.org/download.cgi[Maven 3.5.3+]) is used as the common build system, which even

docs/src/reference/gremlin-applications.asciidoc

@@ -70,7 +70,7 @@ analysis, small to medium sized data loading projects and other exploratory func
 highly extensible, featuring a rich plugin system that allows new tools, commands,
 link:http://en.wikipedia.org/wiki/Domain-specific_language[DSLs], etc. to be exposed to users.
 
-To start the Gremlin Console, run `gremlin.sh` or `gremlin.bat` (`gremlin-java8.bat` for Java 8):
+To start the Gremlin Console, run `gremlin.sh` or `gremlin.bat`:
 
 [source,text]
 ----
@@ -1066,7 +1066,7 @@ The following table describes the various YAML configuration options that Gremli
 |ssl.enabled |Determines if SSL is turned on or not. |false
 |ssl.keyStore |The private key in JKS or PKCS#12 format.  |_none_
 |ssl.keyStorePassword |The password of the `keyStore` if it is password-protected. |_none_
-|ssl.keyStoreType |`JKS` (Java 8 default) or `PKCS12` (Java 9+ default) |_none_
+|ssl.keyStoreType |`PKCS12` |_none_
 |ssl.needClientAuth | Optional. One of NONE, REQUIRE.  Enables client certificate authentication at the enforcement level specified. Can be used in combination with Authenticator. |_none_
 |ssl.sslCipherSuites |The list of JSSE ciphers to support for SSL connections. If specified, only the ciphers that are listed and supported will be enabled. If not specified, the JVM default is used.  |_none_
 |ssl.sslEnabledProtocols |The list of SSL protocols to support for SSL connections. If specified, only the protocols that are listed and supported will be enabled. If not specified, the JVM default is used.  |_none_

docs/src/reference/gremlin-variants.asciidoc

@@ -789,7 +789,7 @@ The following table describes the various configuration options for the Gremlin
 |connectionPool.keepAliveInterval |Length of time in milliseconds to wait on an idle connection before sending a keep-alive request. Set to zero to disable this feature. |180000
 |connectionPool.keyStore |The private key in JKS or PKCS#12 format. |_none_
 |connectionPool.keyStorePassword |The password of the `keyStore` if it is password-protected. |_none_
-|connectionPool.keyStoreType |`JKS` (Java 8 default) or `PKCS12` (Java 9+ default)|_none_
+|connectionPool.keyStoreType |`PKCS12` |_none_
 |connectionPool.maxContentLength |The maximum length in bytes that a message can be sent to the server. This number can be no greater than the setting of the same name in the server configuration. |65536
 |connectionPool.maxInProcessPerConnection |The maximum number of in-flight requests that can occur on a connection. |4
 |connectionPool.maxSimultaneousUsagePerConnection |The maximum number of times that a connection can be borrowed from the pool simultaneously. |16

docs/src/tutorials/getting-started/index.asciidoc

@@ -72,7 +72,7 @@ plugin activated: tinkerpop.tinkergraph
 gremlin>
 ----
 
-TIP: Windows users may use the included `bin/gremlin.bat` (`bin/gremlin-java8.bat` for Java 8) file to start the Gremlin
+TIP: Windows users may use the included `bin/gremlin.bat` file to start the Gremlin
 Console.
 
 TIP: If you make a mistake when entering a command and the prompt gets "stuck" (for example, after a syntax error or an

docs/src/upgrade/release-3.8.x.asciidoc

@@ -30,6 +30,10 @@ complete list of all the modifications that are part of this release.
 
 === Upgrading for Users
 
+==== Set minimum Java version to 11
+
+TinkerPop 3.8 requires a minimum of Java 11 for building and running. Support for Java 1.8 has been dropped.
+
 ==== Auto-promotion of Numbers
 
 Previously, operations like `sum` or `sack` that involved mathematical calculations did not automatically promote the
@@ -396,6 +400,10 @@ link:https://issues.apache.org/jira/browse/TINKERPOP-2974[TINKERPOP-2974]
 
 ==== Graph System Providers
 
+==== Set minimum Java version to 11
+
+TinkerPop 3.8 requires a minimum of Java 11 for building and running. Support for Java 1.8 has been dropped.
+
 ===== Test Suite Changes
 
 In 3.6.0, providers were encouraged to begin using the Gherkin test suite for testing Gremlin rather than the original