diff --git a/__tests__/setup-java.test.ts b/__tests__/setup-java.test.ts
index 48f15ff..c9cf24a 100644
--- a/__tests__/setup-java.test.ts
+++ b/__tests__/setup-java.test.ts
@@ -1,3 +1,98 @@
-describe('TODO - Add a test suite', () => {
-  it('TODO - Add a test', async () => {});
+import io = require('@actions/io');
+import fs = require('fs');
+import path = require('path');
+import child_process = require('child_process');
+
+const toolDir = path.join(__dirname, 'runner', 'tools');
+const tempDir = path.join(__dirname, 'runner', 'temp');
+const javaDir = path.join(__dirname, 'runner', 'java');
+
+process.env['RUNNER_TOOLSDIRECTORY'] = toolDir;
+process.env['RUNNER_TEMPDIRECTORY'] = tempDir;
+import * as installer from '../src/installer';
+
+let javaFilePath = '';
+let javaUrl = '';
+if (process.platform === 'win32') {
+  javaFilePath = path.join(javaDir, 'java_win.zip');
+  javaUrl =
+    'https://download.java.net/java/GA/jdk12/33/GPL/openjdk-12_windows-x64_bin.zip';
+} else if (process.platform === 'darwin') {
+  javaFilePath = path.join(javaDir, 'java_mac.tar.gz');
+  javaUrl =
+    'https://download.java.net/java/GA/jdk12/33/GPL/openjdk-12_osx-x64_bin.tar.gz';
+} else {
+  javaFilePath = path.join(javaDir, 'java_linux.tar.gz');
+  javaUrl =
+    'https://download.java.net/java/GA/jdk12/33/GPL/openjdk-12_linux-x64_bin.tar.gz';
+}
+
+describe('installer tests', () => {
+  beforeAll(async () => {
+    await io.rmRF(toolDir);
+    await io.rmRF(tempDir);
+    if (!fs.existsSync(`${javaFilePath}.complete`)) {
+      // Download java
+      await io.mkdirP(javaDir);
+
+      console.log('Downloading java');
+      child_process.execSync(`curl "${javaUrl}" > "${javaFilePath}"`);
+      // Write complete file so we know it was successful
+      fs.writeFileSync(`${javaFilePath}.complete`, 'content');
+    }
+  }, 300000);
+
+  afterAll(async () => {
+    try {
+      await io.rmRF(toolDir);
+      await io.rmRF(tempDir);
+    } catch {
+      console.log('Failed to remove test directories');
+    }
+  }, 100000);
+
+  it('Acquires version of Java if no matching version is installed', async () => {
+    await installer.getJava('12', 'x64', javaFilePath);
+    const JavaDir = path.join(toolDir, 'Java', '12.0.0', 'x64');
+
+    expect(fs.existsSync(`${JavaDir}.complete`)).toBe(true);
+    expect(fs.existsSync(path.join(JavaDir, 'bin'))).toBe(true);
+  }, 100000);
+
+  it('Throws if invalid directory to jdk', async () => {
+    let thrown = false;
+    try {
+      await installer.getJava('1000', 'x64', 'bad path');
+    } catch {
+      thrown = true;
+    }
+    expect(thrown).toBe(true);
+  });
+
+  it('Uses version of Java installed in cache', async () => {
+    const JavaDir: string = path.join(toolDir, 'Java', '250.0.0', 'x64');
+    await io.mkdirP(JavaDir);
+    fs.writeFileSync(`${JavaDir}.complete`, 'hello');
+    // This will throw if it doesn't find it in the cache (because no such version exists)
+    await installer.getJava(
+      '250',
+      'x64',
+      'path shouldnt matter, found in cache'
+    );
+    return;
+  });
+
+  it('Doesnt use version of Java that was only partially installed in cache', async () => {
+    const JavaDir: string = path.join(toolDir, 'Java', '251.0.0', 'x64');
+    await io.mkdirP(JavaDir);
+    let thrown = false;
+    try {
+      // This will throw if it doesn't find it in the cache (because no such version exists)
+      await installer.getJava('251', 'x64', 'bad path');
+    } catch {
+      thrown = true;
+    }
+    expect(thrown).toBe(true);
+    return;
+  });
 });
diff --git a/action.yml b/action.yml
index 53e131d..04e2730 100644
--- a/action.yml
+++ b/action.yml
@@ -3,7 +3,14 @@ description: 'Setup your runner with Java'
 author: 'GitHub'
 inputs: 
   version:
-    description: 'Version of JDK to use'
+    description: 'A number that specifies the JDK version to make available on the path. Use a whole number version, such as 10'
+    required: true
+  architecture:
+    description: 'The architecture (x86, x64) of the JDK.'
+    required: true
+  jdkFile:
+    description: 'Path to where the compressed JDK is located. The path could be in your source repository or a local path on the agent.'
+    required: true
 runs:
   using: 'node12'
   main: 'lib/setup-java.js'
diff --git a/lib/installer.js b/lib/installer.js
new file mode 100644
index 0000000..1c5c8c5
--- /dev/null
+++ b/lib/installer.js
@@ -0,0 +1,142 @@
+"use strict";
+var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
+    return new (P || (P = Promise))(function (resolve, reject) {
+        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
+        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
+        function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
+    });
+};
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (Object.hasOwnProperty.call(mod, k)) result[k] = mod[k];
+    result["default"] = mod;
+    return result;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+let tempDirectory = process.env['RUNNER_TEMPDIRECTORY'] || '';
+const core = __importStar(require("@actions/core"));
+const io = __importStar(require("@actions/io"));
+const exec = __importStar(require("@actions/exec"));
+const tc = __importStar(require("@actions/tool-cache"));
+const fs = __importStar(require("fs"));
+const path = __importStar(require("path"));
+const IS_WINDOWS = process.platform === 'win32';
+if (!tempDirectory) {
+    let baseLocation;
+    if (IS_WINDOWS) {
+        // On windows use the USERPROFILE env variable
+        baseLocation = process.env['USERPROFILE'] || 'C:\\';
+    }
+    else {
+        if (process.platform === 'darwin') {
+            baseLocation = '/Users';
+        }
+        else {
+            baseLocation = '/home';
+        }
+    }
+    tempDirectory = path.join(baseLocation, 'actions', 'temp');
+}
+function getJava(version, arch, jdkFile) {
+    return __awaiter(this, void 0, void 0, function* () {
+        let toolPath = tc.find('Java', version);
+        if (toolPath) {
+            core.debug(`Tool found in cache ${toolPath}`);
+        }
+        else {
+            core.debug('Retrieving Jdk from local path');
+            const compressedFileExtension = getFileEnding(jdkFile);
+            let tempDir = path.join(tempDirectory, 'temp_' + Math.floor(Math.random() * 2000000000));
+            const jdkDir = yield unzipJavaDownload(jdkFile, compressedFileExtension, tempDir);
+            core.debug(`jdk extracted to ${jdkDir}`);
+            toolPath = yield tc.cacheDir(jdkDir, 'Java', `${version}.0.0`, arch);
+        }
+        let extendedJavaHome = 'JAVA_HOME_' + version + '_' + arch;
+        core.exportVariable('JAVA_HOME', toolPath);
+        core.exportVariable(extendedJavaHome, toolPath);
+        core.addPath(path.join(toolPath, 'bin'));
+    });
+}
+exports.getJava = getJava;
+function getFileEnding(file) {
+    let fileEnding = '';
+    if (file.endsWith('.tar')) {
+        fileEnding = '.tar';
+    }
+    else if (file.endsWith('.tar.gz')) {
+        fileEnding = '.tar.gz';
+    }
+    else if (file.endsWith('.zip')) {
+        fileEnding = '.zip';
+    }
+    else if (file.endsWith('.7z')) {
+        fileEnding = '.7z';
+    }
+    else {
+        throw new Error(`${file} has an unsupported file extension`);
+    }
+    return fileEnding;
+}
+function extractFiles(file, fileEnding, destinationFolder) {
+    return __awaiter(this, void 0, void 0, function* () {
+        const stats = fs.statSync(file);
+        if (!stats) {
+            throw new Error(`Failed to extract ${file} - it doesn't exist`);
+        }
+        else if (stats.isDirectory()) {
+            throw new Error(`Failed to extract ${file} - it is a directory`);
+        }
+        if ('.tar' === fileEnding || '.tar.gz' === fileEnding) {
+            yield tc.extractTar(file, destinationFolder);
+        }
+        else if ('.zip' === fileEnding) {
+            yield tc.extractZip(file, destinationFolder);
+        }
+        else {
+            // fall through and use sevenZip
+            yield tc.extract7z(file, destinationFolder);
+        }
+    });
+}
+// This method recursively finds all .pack files under fsPath and unpacks them with the unpack200 tool
+function unpackJars(fsPath, javaBinPath) {
+    return __awaiter(this, void 0, void 0, function* () {
+        if (fs.existsSync(fsPath)) {
+            if (fs.lstatSync(fsPath).isDirectory()) {
+                for (const file in fs.readdirSync(fsPath)) {
+                    const curPath = path.join(fsPath, file);
+                    yield unpackJars(curPath, javaBinPath);
+                }
+            }
+            else if (path.extname(fsPath).toLowerCase() === '.pack') {
+                // Unpack the pack file synchonously
+                const p = path.parse(fsPath);
+                const toolName = IS_WINDOWS ? 'unpack200.exe' : 'unpack200';
+                const args = IS_WINDOWS ? '-r -v -l ""' : '';
+                const name = path.join(p.dir, p.name);
+                yield exec.exec(`"${path.join(javaBinPath, toolName)}"`, [
+                    `${args} "${name}.pack" "${name}.jar"`
+                ]);
+            }
+        }
+    });
+}
+function unzipJavaDownload(repoRoot, fileEnding, destinationFolder) {
+    return __awaiter(this, void 0, void 0, function* () {
+        // Create the destination folder if it doesn't exist
+        yield io.mkdirP(destinationFolder);
+        const jdkFile = path.normalize(repoRoot);
+        const stats = fs.statSync(jdkFile);
+        if (stats.isFile()) {
+            yield extractFiles(jdkFile, fileEnding, destinationFolder);
+            const jdkDirectory = path.join(destinationFolder, fs.readdirSync(destinationFolder)[0]);
+            yield unpackJars(jdkDirectory, path.join(jdkDirectory, 'bin'));
+            return jdkDirectory;
+        }
+        else {
+            throw new Error(`Jdk argument ${jdkFile} is not a file`);
+        }
+    });
+}
diff --git a/lib/setup-java.js b/lib/setup-java.js
index 072b3f2..810fc74 100644
--- a/lib/setup-java.js
+++ b/lib/setup-java.js
@@ -16,10 +16,18 @@ var __importStar = (this && this.__importStar) || function (mod) {
 };
 Object.defineProperty(exports, "__esModule", { value: true });
 const core = __importStar(require("@actions/core"));
+const installer = __importStar(require("./installer"));
 function run() {
     return __awaiter(this, void 0, void 0, function* () {
-        const myInput = core.getInput('myInput');
-        core.debug(`Hello ${myInput}`);
+        try {
+            const version = core.getInput('version', { required: true });
+            const arch = core.getInput('architecture', { required: true });
+            const jdkFile = core.getInput('jdkFile', { required: true });
+            yield installer.getJava(version, arch, jdkFile);
+        }
+        catch (error) {
+            core.setFailed(error.message);
+        }
     });
 }
 run();
diff --git a/src/installer.ts b/src/installer.ts
new file mode 100644
index 0000000..dbd114b
--- /dev/null
+++ b/src/installer.ts
@@ -0,0 +1,140 @@
+let tempDirectory = process.env['RUNNER_TEMPDIRECTORY'] || '';
+
+import * as core from '@actions/core';
+import * as io from '@actions/io';
+import * as exec from '@actions/exec';
+import * as tc from '@actions/tool-cache';
+import * as fs from 'fs';
+import * as path from 'path';
+
+const IS_WINDOWS = process.platform === 'win32';
+
+if (!tempDirectory) {
+  let baseLocation;
+  if (IS_WINDOWS) {
+    // On windows use the USERPROFILE env variable
+    baseLocation = process.env['USERPROFILE'] || 'C:\\';
+  } else {
+    if (process.platform === 'darwin') {
+      baseLocation = '/Users';
+    } else {
+      baseLocation = '/home';
+    }
+  }
+  tempDirectory = path.join(baseLocation, 'actions', 'temp');
+}
+
+export async function getJava(
+  version: string,
+  arch: string,
+  jdkFile: string
+): Promise<void> {
+  let toolPath = tc.find('Java', version);
+
+  if (toolPath) {
+    core.debug(`Tool found in cache ${toolPath}`);
+  } else {
+    core.debug('Retrieving Jdk from local path');
+    const compressedFileExtension = getFileEnding(jdkFile);
+    let tempDir: string = path.join(
+      tempDirectory,
+      'temp_' + Math.floor(Math.random() * 2000000000)
+    );
+    const jdkDir = await unzipJavaDownload(
+      jdkFile,
+      compressedFileExtension,
+      tempDir
+    );
+    core.debug(`jdk extracted to ${jdkDir}`);
+    toolPath = await tc.cacheDir(jdkDir, 'Java', `${version}.0.0`, arch);
+  }
+
+  let extendedJavaHome = 'JAVA_HOME_' + version + '_' + arch;
+  core.exportVariable('JAVA_HOME', toolPath);
+  core.exportVariable(extendedJavaHome, toolPath);
+  core.addPath(path.join(toolPath, 'bin'));
+}
+
+function getFileEnding(file: string): string {
+  let fileEnding = '';
+
+  if (file.endsWith('.tar')) {
+    fileEnding = '.tar';
+  } else if (file.endsWith('.tar.gz')) {
+    fileEnding = '.tar.gz';
+  } else if (file.endsWith('.zip')) {
+    fileEnding = '.zip';
+  } else if (file.endsWith('.7z')) {
+    fileEnding = '.7z';
+  } else {
+    throw new Error(`${file} has an unsupported file extension`);
+  }
+
+  return fileEnding;
+}
+
+async function extractFiles(
+  file: string,
+  fileEnding: string,
+  destinationFolder: string
+): Promise<void> {
+  const stats = fs.statSync(file);
+  if (!stats) {
+    throw new Error(`Failed to extract ${file} - it doesn't exist`);
+  } else if (stats.isDirectory()) {
+    throw new Error(`Failed to extract ${file} - it is a directory`);
+  }
+
+  if ('.tar' === fileEnding || '.tar.gz' === fileEnding) {
+    await tc.extractTar(file, destinationFolder);
+  } else if ('.zip' === fileEnding) {
+    await tc.extractZip(file, destinationFolder);
+  } else {
+    // fall through and use sevenZip
+    await tc.extract7z(file, destinationFolder);
+  }
+}
+
+// This method recursively finds all .pack files under fsPath and unpacks them with the unpack200 tool
+async function unpackJars(fsPath: string, javaBinPath: string) {
+  if (fs.existsSync(fsPath)) {
+    if (fs.lstatSync(fsPath).isDirectory()) {
+      for (const file in fs.readdirSync(fsPath)) {
+        const curPath = path.join(fsPath, file);
+        await unpackJars(curPath, javaBinPath);
+      }
+    } else if (path.extname(fsPath).toLowerCase() === '.pack') {
+      // Unpack the pack file synchonously
+      const p = path.parse(fsPath);
+      const toolName = IS_WINDOWS ? 'unpack200.exe' : 'unpack200';
+      const args = IS_WINDOWS ? '-r -v -l ""' : '';
+      const name = path.join(p.dir, p.name);
+      await exec.exec(`"${path.join(javaBinPath, toolName)}"`, [
+        `${args} "${name}.pack" "${name}.jar"`
+      ]);
+    }
+  }
+}
+
+async function unzipJavaDownload(
+  repoRoot: string,
+  fileEnding: string,
+  destinationFolder: string
+): Promise<string> {
+  // Create the destination folder if it doesn't exist
+  await io.mkdirP(destinationFolder);
+
+  const jdkFile = path.normalize(repoRoot);
+  const stats = fs.statSync(jdkFile);
+  if (stats.isFile()) {
+    await extractFiles(jdkFile, fileEnding, destinationFolder);
+    const jdkDirectory = path.join(
+      destinationFolder,
+      fs.readdirSync(destinationFolder)[0]
+    );
+    await unpackJars(jdkDirectory, path.join(jdkDirectory, 'bin'));
+    return jdkDirectory;
+  } else {
+    throw new Error(`Jdk argument ${jdkFile} is not a file`);
+  }
+}
diff --git a/src/setup-java.ts b/src/setup-java.ts
index a461915..a24ac15 100644
--- a/src/setup-java.ts
+++ b/src/setup-java.ts
@@ -1,8 +1,16 @@
 import * as core from '@actions/core';
+import * as installer from './installer';
 
 async function run() {
-  const myInput = core.getInput('myInput');
-  core.debug(`Hello ${myInput}`);
+  try {
+    const version = core.getInput('version', {required: true});
+    const arch = core.getInput('architecture', {required: true});
+    const jdkFile = core.getInput('jdkFile', {required: true});
+
+    await installer.getJava(version, arch, jdkFile);
+  } catch (error) {
+    core.setFailed(error.message);
+  }
 }
 
 run();