diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..4a16292
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,16 @@
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Set up JDK
+      uses: actions/setup-java@v1
+      with:
+        java-version: 12
+    - name: Build with Gradle
+      run: ./gradlew build
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..87e5f97
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,8 @@
+.DS_Store
+
+.gradle
+
+build/
+
+.idea/
+out/
diff --git a/build.gradle b/build.gradle
new file mode 100644
index 0000000..51049df
--- /dev/null
+++ b/build.gradle
@@ -0,0 +1,5 @@
+subprojects {
+    repositories {
+        jcenter()
+    }
+}
\ No newline at end of file
diff --git a/example/build.gradle b/example/build.gradle
new file mode 100644
index 0000000..414be07
--- /dev/null
+++ b/example/build.gradle
@@ -0,0 +1,16 @@
+plugins {
+    id "java"
+}
+
+sourceCompatibility = targetCompatibility = 12
+
+compileJava {
+    options.compilerArgs = [
+            "--enable-preview",
+            "-Xplugin:jabel"
+    ]
+}
+
+dependencies {
+    annotationProcessor project(":jabel-javac-plugin")
+}
\ No newline at end of file
diff --git a/example/src/main/java/com/example/JabelExample.java b/example/src/main/java/com/example/JabelExample.java
new file mode 100644
index 0000000..c6780a7
--- /dev/null
+++ b/example/src/main/java/com/example/JabelExample.java
@@ -0,0 +1,28 @@
+package com.example;
+
+public class JabelExample {
+    public static void main(String[] args) {
+        var result = switch (args.length) {
+            case 1 -> {
+                break "one";
+            }
+            case 2, 3 -> "two or three";
+            default -> new JabelExample().new Inner().innerPublic();
+        };
+
+        System.out.println(result);
+    }
+
+    private String outerPrivate() {
+        // Test indy strings
+        return "idk " + Integer.toString(0);
+    }
+
+    class Inner {
+
+        public String innerPublic() {
+            // Test nest-mate
+            return outerPrivate();
+        }
+    }
+}
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..5c2d1cf
Binary files /dev/null and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..59b5f89
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.1-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
new file mode 100755
index 0000000..b0d6d0a
--- /dev/null
+++ b/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" "$@"
diff --git a/gradlew.bat b/gradlew.bat
new file mode 100644
index 0000000..9991c50
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,100 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      http://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/jabel-javac-plugin/build.gradle b/jabel-javac-plugin/build.gradle
new file mode 100644
index 0000000..9aeb532
--- /dev/null
+++ b/jabel-javac-plugin/build.gradle
@@ -0,0 +1,10 @@
+plugins {
+    id "java"
+}
+
+sourceCompatibility = targetCompatibility = 8
+
+dependencies {
+    compile 'net.bytebuddy:byte-buddy:1.10.1'
+    compile 'net.bytebuddy:byte-buddy-agent:1.10.1'
+}
\ No newline at end of file
diff --git a/jabel-javac-plugin/src/main/java/com/github/bsideup/jabel/JabelJavacPlugin.java b/jabel-javac-plugin/src/main/java/com/github/bsideup/jabel/JabelJavacPlugin.java
new file mode 100644
index 0000000..03fc823
--- /dev/null
+++ b/jabel-javac-plugin/src/main/java/com/github/bsideup/jabel/JabelJavacPlugin.java
@@ -0,0 +1,180 @@
+package com.github.bsideup.jabel;
+
+import com.sun.source.util.JavacTask;
+import com.sun.source.util.Plugin;
+import com.sun.tools.javac.api.BasicJavacTask;
+import com.sun.tools.javac.jvm.ClassFile;
+import com.sun.tools.javac.jvm.ClassWriter;
+import com.sun.tools.javac.jvm.Gen;
+import com.sun.tools.javac.jvm.StringConcat;
+import com.sun.tools.javac.jvm.Target;
+import com.sun.tools.javac.util.Context;
+import net.bytebuddy.ByteBuddy;
+import net.bytebuddy.agent.ByteBuddyAgent;
+import net.bytebuddy.asm.AsmVisitorWrapper;
+import net.bytebuddy.description.field.FieldDescription;
+import net.bytebuddy.description.field.FieldList;
+import net.bytebuddy.description.method.MethodList;
+import net.bytebuddy.description.type.TypeDescription;
+import net.bytebuddy.dynamic.loading.ClassReloadingStrategy;
+import net.bytebuddy.implementation.FixedValue;
+import net.bytebuddy.implementation.Implementation;
+import net.bytebuddy.jar.asm.ClassVisitor;
+import net.bytebuddy.jar.asm.MethodVisitor;
+import net.bytebuddy.jar.asm.Opcodes;
+import net.bytebuddy.pool.TypePool;
+
+import java.lang.reflect.Field;
+
+import static net.bytebuddy.jar.asm.Opcodes.ASM7;
+import static net.bytebuddy.matcher.ElementMatchers.named;
+import static net.bytebuddy.matcher.ElementMatchers.none;
+
+public class JabelJavacPlugin implements Plugin {
+
+    @Override
+    public String getName() {
+        return "jabel";
+    }
+
+    @Override
+    public void init(JavacTask task, String... args) {
+        System.out.println("Jabel: init");
+
+        ByteBuddyAgent.install();
+
+        ByteBuddy byteBuddy = new ByteBuddy();
+
+        byteBuddy
+                .redefine(Target.class)
+                .method(
+                        none()
+                                .or(named("hasNestmateAccess"))
+                                .or(named("hasStringConcatFactory"))
+                                .or(named("hasVirtualPrivateInvoke"))
+                )
+                .intercept(FixedValue.value(false))
+                .make()
+                .load(Target.class.getClassLoader(), ClassReloadingStrategy.fromInstalledAgent());
+
+        byteBuddy
+                .redefine(ClassWriter.class)
+                .visit(new AsmVisitorWrapper() {
+                    @Override
+                    public int mergeWriter(int flags) {
+                        return flags;
+                    }
+
+                    @Override
+                    public int mergeReader(int flags) {
+                        return flags;
+                    }
+
+                    @Override
+                    public ClassVisitor wrap(
+                            TypeDescription instrumentedType,
+                            ClassVisitor classVisitor,
+                            Implementation.Context implementationContext,
+                            TypePool typePool,
+                            FieldList<FieldDescription.InDefinedShape> fields,
+                            MethodList<?> methods,
+                            int writerFlags,
+                            int readerFlags
+                    ) {
+                        return new ClassWriterClassVisitor(classVisitor);
+                    }
+                })
+                .make()
+                .load(ClassFile.class.getClassLoader(), ClassReloadingStrategy.fromInstalledAgent());
+
+        Context context = ((BasicJavacTask) task).getContext();
+
+        Target target = Target.instance(context);
+
+        if (target.compareTo(Target.JDK1_8) > 0) {
+            if (target.hasNestmateAccess()) {
+                throw new IllegalStateException("Nestmate instrumentation failed!");
+            }
+            if (target.hasStringConcatFactory()) {
+                throw new IllegalStateException("StringConcat instrumentation failed!");
+            }
+            if (target.hasVirtualPrivateInvoke()) {
+                throw new IllegalStateException("Virtual private invoke instrumentation failed!");
+            }
+        }
+
+        try {
+            {
+                Field field = Target.class.getDeclaredField("majorVersion");
+                field.setAccessible(true);
+                field.set(target, Target.JDK1_8.majorVersion);
+            }
+
+            {
+                Field field = Target.class.getDeclaredField("minorVersion");
+                field.setAccessible(true);
+                field.set(target, Target.JDK1_8.minorVersion);
+            }
+
+            {
+                Field field = StringConcat.class.getDeclaredField("concatKey");
+                field.setAccessible(true);
+
+                Object key = field.get(null);
+                // reset StringConcat
+                context.put((Context.Key) key, (Object) null);
+            }
+
+            {
+                Field field = Gen.class.getDeclaredField("concat");
+                field.setAccessible(true);
+
+                field.set(Gen.instance(context), StringConcat.instance(context));
+            }
+        } catch (Throwable e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    private static class ClassWriterClassVisitor extends ClassVisitor {
+
+        // Create boxed constants
+        static final Integer PREVIEW_MINOR_VERSION = ClassFile.PREVIEW_MINOR_VERSION;
+
+        static final Integer JAVA_MAGIC = ClassFile.JAVA_MAGIC;
+
+        ClassWriterClassVisitor(ClassVisitor classVisitor) {
+            super(Opcodes.ASM7, classVisitor);
+        }
+
+        @Override
+        public MethodVisitor visitMethod(int access, String name, String descriptor, String signature, String[] exceptions) {
+            MethodVisitor methodVisitor = super.visitMethod(access, name, descriptor, signature, exceptions);
+            if ("writeClassFile".equals(name)) {
+                return new MethodVisitor(ASM7, methodVisitor) {
+
+                    int stage = 0;
+
+                    @Override
+                    public void visitLdcInsn(Object value) {
+                        switch (stage) {
+                            case 0:
+                                if (JAVA_MAGIC.equals(value)) {
+                                    stage = 1;
+                                }
+                                break;
+                            case 1:
+                                if (PREVIEW_MINOR_VERSION.equals(value)) {
+                                    stage = 2;
+                                    value = Target.JDK1_8.minorVersion;
+                                }
+                        }
+
+                        super.visitLdcInsn(value);
+                    }
+                };
+            }
+            return methodVisitor;
+        }
+    }
+}
diff --git a/jabel-javac-plugin/src/main/resources/META-INF/services/com.sun.source.util.Plugin b/jabel-javac-plugin/src/main/resources/META-INF/services/com.sun.source.util.Plugin
new file mode 100644
index 0000000..141b01e
--- /dev/null
+++ b/jabel-javac-plugin/src/main/resources/META-INF/services/com.sun.source.util.Plugin
@@ -0,0 +1 @@
+com.github.bsideup.jabel.JabelJavacPlugin
\ No newline at end of file
diff --git a/settings.gradle b/settings.gradle
new file mode 100644
index 0000000..26b60bd
--- /dev/null
+++ b/settings.gradle
@@ -0,0 +1,4 @@
+rootProject.name = 'jabel'
+
+include 'jabel-javac-plugin'
+include 'example'
\ No newline at end of file