Add a gradle example app and build it in the release script.

This gives us some guarantee that the jars we're releasing to maven actually build.

I will add more of these gradle examples to test the other artifacts in follow-up CLs.

RELNOTES=Adds a simple gradle example and adds it to the release script.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=276777748

java/dagger/example/gradle/simple/BUILD

@@ -0,0 +1,18 @@
+# Copyright (C) 2019 The Dagger Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# Description:
+#   A skeleton example that uses gradle to test the LOCAL-SNAPSHOTs.
+
+package(default_visibility = ["//:src"])

java/dagger/example/gradle/simple/SimpleApplication.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2019 The Dagger Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package dagger.example.gradle.simple;
+
+import dagger.Component;
+import dagger.Module;
+import dagger.Provides;
+import javax.inject.Inject;
+import javax.inject.Singleton;
+
+/** A simple, skeletal application that defines a simple component. */
+public class SimpleApplication {
+  static final class Foo {
+    @Inject Foo() {}
+  }
+
+  @Module
+  static final class SimpleModule {
+    @Provides
+    static Foo provideFoo() {
+      return new Foo();
+    }
+  }
+
+  @Singleton
+  @Component(modules = { SimpleModule.class })
+  interface SimpleComponent {
+    Foo foo();
+  }
+
+  public static void main(String[] args) {
+    Foo foo = DaggerSimpleApplication_SimpleComponent.create().foo();
+  }
+}

java/dagger/example/gradle/simple/build.gradle

@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2019 The Dagger Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+plugins {
+  id 'java'
+  id 'application'
+}
+
+repositories {
+  mavenCentral()
+  mavenLocal()
+}
+
+sourceSets {
+  main {
+    java {
+      srcDir '.'
+    }
+  }
+}
+
+dependencies {
+  implementation 'com.google.dagger:dagger:LOCAL-SNAPSHOT'
+  annotationProcessor 'com.google.dagger:dagger-compiler:LOCAL-SNAPSHOT'
+}
+
+mainClassName = 'dagger.example.gradle.simple.SimpleApplication'

java/dagger/example/gradle/simple/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.4.1-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

java/dagger/example/gradle/simple/gradlew

@@ -0,0 +1,188 @@
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=$(save "$@")
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
+  cd "$(dirname "$0")"
+fi
+
+exec "$JAVACMD" "$@"

util/deploy-to-maven-central.sh

@@ -6,50 +6,50 @@ if [ $# -lt 2 ]; then
   echo "usage $0 <ssl-key> <version-name> [<param> ...]"
   exit 1;
 fi
-key=$1
-version_name=$2
+readonly KEY=$1
+readonly VERSION_NAME=$2
 shift 2
 
-if [[ ! "$version_name" =~ ^2\. ]]; then
+if [[ ! "$VERSION_NAME" =~ ^2\. ]]; then
   echo 'Version name must begin with "2."'
   exit 2
 fi
 
-if [[ "$version_name" =~ " " ]]; then
+if [[ "$VERSION_NAME" =~ " " ]]; then
   echo "Version name must not have any spaces"
   exit 3
 fi
 
-bazel test //...
+bash $(dirname $0)/run-local-tests.sh
 
 bash $(dirname $0)/execute-deploy.sh \
   "gpg:sign-and-deploy-file" \
-  "$version_name" \
+  "$VERSION_NAME" \
   "-DrepositoryId=sonatype-nexus-staging" \
   "-Durl=https://oss.sonatype.org/service/local/staging/deploy/maven2/" \
-  "-Dgpg.keyname=${key}"
+  "-Dgpg.keyname=${KEY}"
 
 # Publish javadocs to gh-pages
 bazel build //:user-docs.jar
 git clone --quiet --branch gh-pages \
     https://github.com/google/dagger gh-pages > /dev/null
 cd gh-pages
-unzip ../bazel-bin/user-docs.jar -d api/$version_name
-rm -rf api/$version_name/META-INF/
-git add api/$version_name
-git commit -m "$version_name docs"
+unzip ../bazel-bin/user-docs.jar -d api/$VERSION_NAME
+rm -rf api/$VERSION_NAME/META-INF/
+git add api/$VERSION_NAME
+git commit -m "$VERSION_NAME docs"
 git push origin gh-pages
 cd ..
 rm -rf gh-pages
 
 git checkout --detach
 # Set the version string that is used as a tag in all of our libraries. If another repo depends on
 # a versioned tag of Dagger, their java_library.tags should match the versioned release.
-sed -i s/'${project.version}'/"${version_name}"/g tools/maven.bzl
-git commit -m "${version_name} release" tools/maven.bzl
+sed -i s/'${project.version}'/"${VERSION_NAME}"/g tools/maven.bzl
+git commit -m "${VERSION_NAME} release" tools/maven.bzl
 
-git tag -a -m "Dagger ${version_name}" dagger-"${version_name}"
-git push origin tag dagger-"${version_name}"
+git tag -a -m "Dagger ${VERSION_NAME}" dagger-"${VERSION_NAME}"
+git push origin tag dagger-"${VERSION_NAME}"
 
 # Switch back to the original HEAD
 git checkout -

util/run-local-tests.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+set -ex
+
+# Run tests with bazel
+bazel test //...
+
+# Also run the gradle examples on the local maven snapshots.
+readonly _SIMPLE_EXAMPLE_DIR=java/dagger/example/gradle/simple
+
+util/install-local-snapshot.sh
+./$_SIMPLE_EXAMPLE_DIR/gradlew -p $_SIMPLE_EXAMPLE_DIR build --stacktrace
+