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This article shows you how to install Java on Mac OSX, and also how to do Java/JDK version switching.

The Java SE Development Kit 8 lets you develop and deploy Java applications on desktops and servers, as well as in today's demanding embedded environments. Java offers the rich user interface, performance, versatility, portability, and security that today’s applications require. 1 thought on “ How to trust a certificate in Java on Mac OS X ” Evan T April 7, 2013 at 10:18 am. FYI, the keystore password is changeit on OSX 10.8.3. But if you just want to download the server certificate, there is no need to specify -showcerts. Echo -n gives a response to the server, so that the connection is released. Sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' removes information about the certificate chain and connection details. This is the preferred format to import the. Add certificate in Java on macOS. Includes examples. Java 2 Standard Edition SDK (J2SE SDK) To develop desktop Java applications or if you need a Java Runtime Environment (JRE) you can use the Java 2 Standard Edition Software Development Kit (J2SE SDK).

Tested with

  • Mac OS 10.15.3
  • JDK 8, 9, 10, 11, 12, 13 (AdoptOpenJDK)

Note
On Mac OSX, Java should installed in this folder; it is Mac’s standard.

We will show you two ways to install Java JDK on Mac, via the popular Homebrew package manager and manually installation.

1. Homebrew

1.1 Install Homebrew and update it.

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1.2 Add adoptopenjdk/openjdk.

1.3 Find all available JDK.

The output may vary.

1.4 Java 8, 9, 10, 11, 12, 13, choose one to install.

This example will install Java 8 and 11 for testing.

1.5 Where Java is installed? /usr/libexec/java_home -V

Homebrew will install the JDK at folder /Library/Java/JavaVirtualMachines/, and this folder is Mac’s standard folder for Java installs.

1.6 Test it, by default, Mac takes the highest version.

1.7 How to do version switching? Refer to below 3. version switching

2. Manual installation

The example shows you how to download the early access JDK 14 and install it on Mac OSX.

Steps

  • Download JDK.
  • Puts the JDK folder at /Library/Java/JavaVirtualMachines.
  • Export JAVA_HOME.

2.1 Download the early access JDK 14 from the OpenJDK website.

2.2 Extracts tar file to /Library/Java/JavaVirtualMachines

2.3 Export JAVA_HOME.

Find out where is JDK 14.

Create or edit the existing ~/.bash_profile with a text editor.

Mac

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Export JAVA_HOME, save and exit.

~/.bash_profile

Reflect the changes

2.4 Test it.

3. Version Switching

In this tutorial, we installed the Java 8 and Java 11 via Homebrew (Step 1), and Java 14 manually (Step 2), so this Mac has three versions now. And the Mac is using the JDK 14.

Note
There are tools like jEnv to manage the Java version switching, but I prefer to manage with export JAVA_HOME manually, it’s simple and easy to understand, no black box magic.

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3.1 Create or edit the existing ~/.bash_profile with a text editor like vim or nano, export JAVA_HOME to the specified JDK we want to use on Mac.

The above changes will make JAVA_HOME point to JAVA 8.

3.2 Reflect the changes.

Done.

If we want to switch JDK version again, update the ~/.bash_profile and export JAVA_HOME to other JDK version.

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References

Tags : beginnerinstall jdkinstall-javamac

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Update Java Certificate

To develop desktop Java applications or if you need a Java Runtime Environment (JRE) you can use the Java 2 Standard Edition Software Development Kit (J2SE SDK).
The latest J2SE SDK version can be downloaded from: http://java.sun.com/j2se/

Quick guides


Add certificate in Java on macOS


Information
I was using the ant get task to get files from https://www.mobilefish.com/..
The ant task shows the following error message:
javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target at sun.security.ssl.Alerts.getSSLException(Alerts.java:192)
To solve this problem you need to add the SSL certificate to the Java keystore.
Operating system used
macOS (Sierra) 10.12.3
Software prerequisites
Java on macOS
Procedure
  1. The Java keystore is located at.
    Type: echo $JAVA_HOME/jre/lib/security
    The Java keystore is the file: $JAVA_HOME/jre/lib/security/cacerts
    Note:
    This means that every installed java version has its own cacerts file.
    If you use another java version you need to reinstall the certificate.
  2. To show all certificates installed in the keystore.
    Type: cd $JAVA_HOME/jre/lib/security
    Type: keytool -list -keystore cacerts
    The keystore password is (default): changeit
    You should see:
    Enter keystore password:
    Keystore type: JKS
    Keystore provider: SUN
    Your keystore contains 104 entries
    verisignclass2g2ca [jdk], Aug 25, 2016, trustedCertEntry,
    Certificate fingerprint (SHA1): B3:EA:C4:4
    :

    Note:
    If you want to see more detailed information, add the -v flag.
    Type: keytool -list -v -keystore cacerts
  3. Before you import the certificate in the keystore make a backup of the keystore.
    Type: cd $JAVA_HOME/jre/lib/security
    Type: sudo cp cacerts cacerts.orig
  4. Import your self signed certificate in the keystore.
    Type: cd $JAVA_HOME/jre/lib/security
    Type: sudo keytool -importcert -alias domain -file /path/to/certificate.crt -keystore cacerts
    For example, type:
    sudo keytool -importcert -alias sand.mobilefish.com -file /etc/apache2/ssl/sand.mobilefish.crt -keystore cacerts
    You should see:
    Password: your_root_password
    Enter keystore password: changeit
    Owner: [email protected], CN=sand.mobilefish.com, OU=Research and development, O=Mobilefish.com, L=Zaandam, ST=Noord-Holland, C=NL
    Issuer: [email protected], CN=sand.mobilefish.com, OU=Research and development, O=Mobilefish.com, L=Zaandam, ST=Noord-Holland, C=NL
    Serial number: 8a7362fba9376522
    Valid from: Fri Aug 25 13:04:25 CEST 2017 until: Mon Aug 23 13:04:25 CEST 2027
    :
    Trust this certificate? [no]: yes
    Certificate was added to keystore

    More information about the keytool.
    Type: keytool -help
  5. To check if the certificate is stored is the keystore.
    Type: cd $JAVA_HOME/jre/lib/security
    Type: sudo keytool -list -keystore cacerts -alias sand.mobilefish.com
    You should see:
    Enter keystore password: changeit
    sand.mobilefish.com, Aug 26, 2017, trustedCertEntry,
    Certificate fingerprint (SHA1): 35:BB:57:11:56:55:12:FF:23:98:22:11:2D:22:00:24:A2:78:77:2

    Note:
    If you want to see more detailed information, add the -v flag.
    Type: sudo keytool -v -list -keystore cacerts -alias sand.mobilefish.com