Remove deprecated Maven build from source documentation and pom.xml f…

…iles.

This was previously marked deprecated in 4.27.x: 4c8da99

See https://protobuf.dev/news/2024-06-26/ for the corresponding News announcement.

PiperOrigin-RevId: 648505157

java/BUILD.bazel

@@ -20,7 +20,7 @@ sh_test(
         "//java/util",
     ] + glob([
         "pom.xml",
-        "*/pom.xml",
+        # "*/pom.xml", # TODO: Get from pom_template.xml
         "test/linkage-monitor-check-bom/pom.xml",
     ]),
     tags = [

java/README.md

@@ -93,50 +93,6 @@ package).
 
 4) Install the classes wherever you prefer.
 
-### Build from Source - With Maven
-
-WARNING: Building from source with Maven is deprecated and will be removed in the 4.28.x release.
-
-1) Install Apache Maven if you don't have it:
-
-     http://maven.apache.org/
-
-2) Build the C++ code, or obtain a binary distribution of protoc (see
-   the toplevel [README.md](../README.md)). If you install a binary
-   distribution, make sure that it is the same version as this package.
-   If in doubt, run:
-
-     $ protoc --version
-
-   You will need to place the protoc executable in ../src.  (If you
-   built it yourself, it should already be there.)
-
-3) Run the tests:
-
-     $ mvn test
-
-   If some tests fail, this library may not work correctly on your
-   system.  Continue at your own risk.
-
-4) Install the library into your Maven repository:
-
-     $ mvn install
-
-5) If you do not use Maven to manage your own build, you can build a
-   .jar file to use:
-
-     $ mvn package
-
-   The .jar will be placed in the "target" directory.
-
-The above instructions will install 2 maven artifacts:
-
-  * protobuf-java: The core Java Protocol Buffers library. Most users only
-                   need this artifact.
-  * protobuf-java-util: Utilities to work with protos. It contains JSON support
-                        as well as utilities to work with proto3 well-known
-                        types.
-
 ## Compatibility Notice
 
 * Protobuf minor version releases are backwards-compatible. If your code

java/core/BUILD.bazel

@@ -13,7 +13,6 @@ load("//java/internal:testing.bzl", "junit_tests")
 load("//upb/cmake:build_defs.bzl", "staleness_test")
 
 LITE_SRCS = [
-    # Keep in sync with `//java/lite:pom.xml`.
     "src/main/java/com/google/protobuf/AbstractMessageLite.java",
     "src/main/java/com/google/protobuf/AbstractParser.java",
     "src/main/java/com/google/protobuf/AbstractProtobufList.java",
@@ -523,7 +522,6 @@ protobuf_java_library(
 )
 
 LITE_TEST_EXCLUSIONS = [
-    # Keep in sync with //java/lite:pom.xml id=copy-test-source-files execution.
     "src/test/java/com/google/protobuf/AbstractMessageTest.java",
     "src/test/java/com/google/protobuf/AbstractProto2SchemaTest.java",
     "src/test/java/com/google/protobuf/AnyTest.java",
@@ -602,7 +600,6 @@ pkg_files(
         "BUILD.bazel",
         "generate-sources-build.xml",
         "generate-test-sources-build.xml",
-        "pom.xml",
         "pom_template.xml",
     ],
     strip_prefix = strip_prefix.from_root(""),

java/kotlin-lite/BUILD.bazel

@@ -233,7 +233,6 @@ pkg_files(
         "generate-sources-build.xml",
         "generate-test-sources-build.xml",
         "lite.awk",
-        "pom.xml",
         "pom_template.xml",
         "process-lite-sources-build.xml",
     ],