avoid loading from defs.bzl (#341)

At least the example should use the preferred load paths.

Closes #341

COPYBARA_INTEGRATE_REVIEW=#341 from benjaminp:no-defs 479d18e
PiperOrigin-RevId: 853768220
Change-Id: Iee1770d77675a9bfb371894aaac0ac6b67320d09

Author: benjaminp

examples/hello_world/BUILD

@@ -1,4 +1,4 @@
-load("//java:defs.bzl", "java_binary")
+load("//java:java_binary.bzl", "java_binary")
 
 package(default_applicable_licenses = ["@rules_java//:license"])
 

java/runfiles/src/main/java/com/google/devtools/build/runfiles/BUILD

@@ -1,4 +1,5 @@
-load("//java:defs.bzl", "java_library", "java_plugin")
+load("//java:java_library.bzl", "java_library")
+load("//java:java_plugin.bzl", "java_plugin")
 
 package(default_applicable_licenses = ["@rules_java//:license"])
 

test/java/private/android_support_tests.bzl

@@ -15,7 +15,8 @@
 
 load("@rules_testing//lib:analysis_test.bzl", "analysis_test", "test_suite")
 load("@rules_testing//lib:util.bzl", "util")
-load("//java:defs.bzl", "java_library", "java_plugin")
+load("//java:java_library.bzl", "java_library")
+load("//java:java_plugin.bzl", "java_plugin")
 load("//java/common:java_info.bzl", "JavaInfo")
 load("//java/private:android_support.bzl", "android_support")  # buildifier: disable=bzl-visibility
 load("//test/java/testutil:java_info_subject.bzl", "java_info_subject")

test/java/testutil/rules/custom_library_with_wrong_plugins_type.bzl

@@ -1,6 +1,7 @@
 """Custom rule to test java_common.compile(plugins = ...) expects JavaPluginInfo"""
 
-load("//java:defs.bzl", "JavaInfo", "java_common")
+load("//java/common:java_common.bzl", "java_common")
+load("//java/common:java_info.bzl", "JavaInfo")
 load("//java/common:java_semantics.bzl", "semantics")
 
 def _impl(ctx):