December 17, 2022

Top 20 AWS Corretto Interview Questions and Answers

 

 

                The Open Java Development Kit is available as a free, multiplatform, production-ready distribution called Amazon Corretto (OpenJDK). Long-term support for Corretto includes security updates as well as performance improvements. The Java SE standard is certified as being compatible with Corretto, which Amazon uses internally on thousands of production services. On well-known operating systems like Linux, Windows, and macOS, you may create and use Java apps using Corretto.

 

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Ques. 1): Why should I use Corretto?

Answer:

Corretto is an enduring version of the OpenJDK that comes with free long-term support. Internally, Amazon uses thousands of production services to run Corretto. Every change we make to Corretto resolves or lessens an issue we encountered while using OpenJDK. Aside from the usual quarterly schedule, Amazon intends to implement urgent fixes (including security) as soon as they are accessible and prepared for usage.

 

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Ques. 2): What is Amazon Corretto?

Answer:

A build of the Open Java Development Kit (OpenJDK) with ongoing support from Amazon is called Corretto. To guarantee that Corretto complies with the Java SE standard and is accessible on Linux, Windows, and macOS, it has been certified using the Java Technical Compatibility Kit (TCK). It covers Amazon patches that have been effective in maintaining its own services.

 

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Ques. 3): What does Corretto's long-term support (LTS) entail?

Answer:

Amazon Corretto is an Open Java Development Kit (OpenJDK) distribution that is free, multiplatform, and has long-term support (LTS). Up until at least the indicated date for the applicable release version, LTS includes Amazon's promise to provide performance improvements and security upgrades without charge (e.g. May 2026 for Corretto 8). The intention is to give updates every three months. When necessary updates are ready and available, Amazon also intends to implement them outside of the typical quarterly cycle, including security fixes.


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Ques. 4): What must I do if I require assistance with Corretto?

Answer:

Refer to our documentation if you have any general inquiries regarding setting up or using Corretto. Please file a bug report with the upstream OpenJDK project if you have a problem with OpenJDK. Please create an issue or a feature request in the Corretto GitHub repository if you have a specific Corretto problem or wish to suggest a feature that does not concern OpenJDK. You can contact Corretto support if you already have an AWS Support Plan by using your plan.


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Ques. 5): Which OS systems are supported by Corretto 11?

Answer:

Amazon offers Corretto 11 installation packages for Windows, macOS, Linux (glibc), and Linux (musl-libc). Additionally, Docker Hub hosts an official Docker image.

Versions 7, 8, 10, Server 2008 R2, Server 2012, Server 2016, and Server 2019 all support Windows builds.

All versions of macOS that are still getting security updates from Apple are supported by macOS builds. Versions 10.15 (Catalina) and later on x64 (Intel) and 11.0 (Big Sur) and later on aarch64 (M1) architectures are currently supported.

Red Hat Enterprise Linux 6+, CentOS 6+, Ubuntu Linux 14+, Debian Linux 8+, Amazon Linux AMI, and SUSE 12+ all support Linux (glibc) builds.

Alpine Linux 3.12 and later supports Linux (musl-libc) builds.

Linux Arm (glibc) builds are supported on Linux ARMv7+ with glibc 2.25+.


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Ques. 6): Why does a security scanner display a CVE in a docker image?

Answer:

The first advised course of action is to look for an updated version of this image if a security scanner discovers that a Corretto-Docker image contains a CVE. There are updated Corretto-Docker photos on this website.

If there isn't an updated image available, use the proper command to update the platform's packages, such as "apk -U upgrade" for Alpine Linux or "yum update -y —security" for AmazonLinux, to remedy the problem right away.

The seller of the base docker image is in charge of promptly releasing security updates for images and packages. For Amazon Linux, AWS only provides base docker images, which are accessible from the Amazon Linux 2 ECR Public Gallery and the Docker Hub Amazon Linux 2 page. From the Docker Hub Alpine Linux website, you may download Alpine-based Docker images.

When a new base image becomes available, Docker Hub automatically rebuilds Docker images, however the Corretto team does not modify our Dockerfiles to incorporate sporadic package upgrades. If a base docker image provider has not yet made a fresh base image broadly accessible,  please contact that supplier to request that the fix be addressed in a new base docker image distribution.


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Ques. 7): How can I support Corretto?

Answer:

As a mechanism to get code into Corretto, Amazon promotes contributions to the OpenJDK project. The entire OpenJDK community gains from your modifications in this way. Amazon will assess bugs and pull requests on GitHub if your contribution is unique to Corretto, such as changes to the build mechanism.


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Ques. 8): What distinguishes Corretto from OpenJDK?

Answer:

Corretto is an Open JDK distribution that includes Amazon's fixes that have not yet been included in the respective OpenJDK update projects. We concentrate on patches that enhance OpenJDK's stability or performance, selected based on Amazon's observations made while running significant services.


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Ques. 9): What is covered by Corretto's ongoing assistance?

Answer:

Corretto's long-term support (LTS) programme offers free performance upgrades and security updates for Corretto 8 and Corretto 11 through at least May 2026 and September 2027, respectively. The intention is to give updates every three months.

AWS Support Plans, which offer professional advice and assistance for achieving your goals on AWS, are unrelated to LTS for Corretto. Corretto is covered if you already have an AWS Support Plan in the same way that all other supported AWS Services and products are. If you don't have a strategy and your only goal is to get help with Corretto, it might or might not make sense for you to buy one. There are currently no plans to launch Corretto-specific assistance plans. As always, amazon’s roadmaps are a reflection of their customer feedback and also amazon welcome customers feature requests at the Corretto GitHub repository.

 

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Ques. 10): Does Corretto come with JavaFX? If so, which Corretto versions include it by default?

Answer:

Earlier than OpenJDK 11, JavaFX was a part of OpenJDK. Oracle, however, uncoupled JavaFX from OpenJDK in 2018 and dropped it from OpenJDK distributions. JavaFX is supported on the following platforms by Corretto 8:

Generic Linux x64 AL2

JDK Windows x86

JDK for Windows x64

JRE for Windows x86 and x64

No of the version, AWS does not include it on other platforms. For instance, Corretto 8 for Mac M1 does not support JavaFX.

As this edition will have more up-to-date code and generally perform better than its predecessors, Amazon advises upgrading to Corretto 17+, ideally Corretto 17.

 

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Ques. 11): What rules apply to Corretto's licence?

Answer:

Corretto is distributed under the same open source licence as OpenJDK, which is covered under the Class Path Exception of the GNU Public License version 2. (GPLv2 with CPE). Corretto can be used similarly to OpenJDK.

 

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Ques. 12): Which types of fixes will Corretto have, according to Amazon?

Answer:

Security fixes, performance improvements (such as speeding up frequently used functions), scheduling garbage collection, preventing out-of-memory situations, and better monitoring, reporting, and thread management are all part of patches.

 

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Ques. 13): Is Corretto compatible with other JDKs as a drop-in replacement?

Answer:

Unless you're utilising features that aren't present in OpenJDK, Corretto is intended to be a drop-in replacement for all Java SE distributions. Existing command-line arguments, tuning parameters, monitoring, and anything else in place will continue to function as before once Corretto binaries are installed on a host and correctly invoked to run your Java programmes (for example, using the alternatives command on Linux).

 

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Ques. 14): Do you have to pay anything to use Corretto?

Answer:

Corretto is given away free of charge by Amazon under an Open Source licence. The Class Path Exception of the GNU Public License version 2 governs its licencing (GPLv2 with CPE). Its use or dissemination are free on Amazon.

 

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Ques. 15): Which operating systems is Corretto 8 compatible with?

Answer:

Amazon offers Corretto 8 installation packages for Windows, macOS, Linux (glibc), and Linux (musl-libc). Additionally, Docker Hub hosts an official Docker image.

Versions 7, 8, 10, Server 2008 R2, Server 2012, Server 2016, and Server 2019 all support Windows builds.

All versions of macOS that are still getting security updates from Apple are supported by macOS builds. Versions 10.15 (Catalina) and later on x64 (Intel) and 11.0 (Big Sur) and later on aarch64 (M1) architectures are currently supported.

Red Hat Enterprise Linux 6+, CentOS 6+, Ubuntu Linux 14+, Debian Linux 8+, Amazon Linux AMI, and SUSE 12+ all support Linux (glibc) builds.

Alpine Linux 3.12 and later supports Linux (musl-libc) builds.

 

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Ques. 16): What contribution does Amazon make to OpenJDK?

Answer:

Amazon began contributing to OpenJDK in 2017, and we intend to increase both the number and complexity of our contributions.

 

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