If you have not yet installed Apple's Java OS X 2012-006 update, then you are still using a version of Apple Java 6 that includes the plug-in and the Java Preferences app. See 'Note for Users of OS X that Include Apple Java 6 Plug-in'. There can be multiple JDKs installed on a system, as many as you wish. Java is a runtime environment maintained by Oracle that you must install on your Mac to be able to run applications written using the Java programming language. Moreover, Java allows developers to make apps available on multiple operating systems at the same time because Java-based utilities will run on any platform that can integrate the runtime environment.
Installing Tomcat 9 on Mac OS X El Capitan is actually quite easy.
The Mac OS X installation process is fairly painless and straight forward, but there are a few rough spots along the way. Follow these step by step instructions to get Tomcat up and running on your Mac OS X machine in no time.
Configure Environment Variables
Prerequisite: Java
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The JDK installer package come in an dmg and installs easily on the Mac; and after opening the Terminal app again,
java -version
Now shows something like this:
java version '1.8.0_66'
Java(TM) SE Runtime Environment (build 1.8.0_66-b17)
Java HotSpot(TM) 64-Bit Server VM (build 25.66-b17, mixed mode)
Whatever you do, when opening Terminal and running java -version, you should see something like this, with a version of at least 1.7.x I.e. Tomcat 9.x requires Java 7 or later.
JAVA_HOME is an important environment variable, not just for Tomcat, and it’s important to get it right.
To set the JAVA_HOME variable, open a new Terminal window and use the following command to open the system profile for editing. (You can substitute your favorite text editor. We like Vim.):
vi ~/.profile
Once you’ve opened the profile, add the following lines to set the JAVA_HOME and CATALINA_HOME variables:
export JAVA_HOME=/Library/Java/Home
export CATALINA_HOME=/Path/To/Tomcat/Home
Installing Tomcat
1. Download Tomcat from the official website (tomcat.apache.org), select Tar.gz format under the Core section
2. Extract the Tomcat to directory: /Library, in order to facilitate the use, rename the folder to 'Tomcat'
3. Open Terminal, modify folder permissions
sudo chmod 755 /Library/Tomcat/bin/*.sh
4. Press the Enter key, then you will be prompted for a password, enter the administrator password. Then continue with the following command to open the tomcat service
sudo sh startup.sh
5. Open the browser and enter http://localhost:8080/, press Enter.
If you see the Apache Tomcat, this means Tomcat has successfully run
That is it! You should now be able to access Apache Tomcat’s welcome page on http://localhost:8080. If you wish to make stopping Tomcat 9, use this command:
sudo sh /Library/Tomcat/bin/shutdown.sh
With an all-new design that looks great on macOS Big Sur, Xcode 12 has customizable font sizes for the navigator, streamlined code completion, and new document tabs. Xcode 12 builds Universal apps by default to support Mac with Apple Silicon, often without changing a single line of code.
Designed for macOS Big Sur.
Xcode 12 looks great on macOS Big Sur, with a navigator sidebar that goes to the top of the window and clear new toolbar buttons. The navigator defaults to a larger font that’s easier to read, while giving you multiple size choices. New document tabs make it easy to create a working set of files within your workspace.
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Document tabs.
The new tab model lets you open a new tab with a double-click, or track the selected file as you click around the navigator. You can re-arrange the document tabs to create a working set of files for your current task, and configure how content is shown within each tab. The navigator tracks the open files within your tabs using strong selection.
Navigator font sizes.
The navigator now tracks the system setting for “Sidebar icon size” used in Finder and Mail. You can also choose a unique font size just for Xcode within Preferences, including the traditional dense information presentation, and up to large fonts and icon targets.
Code completion streamlined.
A new completion UI presents only the information you need, taking up less screen space as you type. And completions are presented much faster, so you can keep coding at maximum speed.
Redesigned organizer.
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An all-new design groups all critical information about each of your apps together in one place. Choose any app from any of your teams, then quickly navigate to inspect crash logs, energy reports, and performance metrics, such as battery consumption and launch time of your apps when used by customers.
SwiftUI
SwiftUI offers new features, improved performance, and the power to do even more, all while maintaining a stable API that makes it easy to bring your existing SwiftUI code forward into Xcode 12. A brand new life cycle management API for apps built with SwiftUI lets you write your entire app in SwiftUI and share even more code across all Apple platforms. And a new widget platform built on SwiftUI lets you build widgets that work great on iPad, iPhone, and Mac. Your SwiftUI views can now be shared with other developers, and appear as first-class controls in the Xcode library. And your existing SwiftUI code continues to work, while providing faster performance, better diagnostics, and access to new controls.
Universal app ready.
Xcode 12 is built as a Universal app that runs 100% natively on Intel-based CPUs and Apple Silicon for great performance and a snappy interface.* It also includes a unified macOS SDK that includes all the frameworks, compilers, debuggers, and other tools you need to build apps that run natively on Apple Silicon and the Intel x86_64 CPU.
Updated automatically
When you open your project in Xcode 12, your app is automatically updated to produce release builds and archives as Universal apps. When you build your app, Xcode produces one binary “slice” for Apple Silicon and one for the Intel x86_64 CPU, then wraps them together as a single app bundle to share or submit to the Mac App Store. You can test this at any time by selecting “Any Mac” as the target in the toolbar.
Test multiple architectures.
On the new Mac with Apple Silicon, you can run and debug apps running on either the native architecture or on Intel virtualization by selecting “My Mac (Rosetta)” in the toolbar.
Multiplatform template
New multiplatform app templates set up new projects to easily share code among iOS, iPadOS, and macOS using SwiftUI and the new lifecycle APIs. The project structure encourages sharing code across all platforms, while creating special custom experiences for each platform where it makes sense for your app.
Improved auto-indentation
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Swift code is auto-formatted as you type to make common Swift code patterns look much better, including special support for the “guard” command.
StoreKit testing
New tools in Xcode let you create StoreKit files that describe the various subscription and in-app purchase products your app can offer, and create test scenarios to make sure everything works great for your customers — all locally testable on your Mac.
Get started.
Download Xcode 12 and use these resources to build apps for all Apple platforms.