jmap | A Java 8 library for the JSON Meta Application Protocol | JSON Processing library

 by   iNPUTmice Java Version: 0.8.13 License: Apache-2.0

kandi X-RAY | jmap Summary

kandi X-RAY | jmap Summary

jmap is a Java library typically used in Utilities, JSON Processing applications. jmap has no bugs, it has no vulnerabilities, it has build file available, it has a Permissive License and it has high support. You can download it from GitHub, Maven.

A library to synchronize data between a client and a server using the JSON Meta Application Protocol. The current focus is on acting as a client library to retrieve emails from a server however it is easily extensible to also synchronize contacts and calendars. It might even be extended to act as a server library. The library is written in Java 8 to provide full compatibility with Android. It uses GSON for JSON serialization and deserialization and makes heavy use of Guava including its Futures. Entities (Mailbox, Email, EmailSubmission, …) and method calls are annotated with Project Lombok’s @Getter and @Builder to make them immutable.
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            kandi-support Support

              jmap has a highly active ecosystem.
              It has 40 star(s) with 8 fork(s). There are 7 watchers for this library.
              OutlinedDot
              It had no major release in the last 12 months.
              There are 11 open issues and 32 have been closed. On average issues are closed in 16 days. There are 3 open pull requests and 0 closed requests.
              OutlinedDot
              It has a negative sentiment in the developer community.
              The latest version of jmap is 0.8.13

            kandi-Quality Quality

              jmap has 0 bugs and 0 code smells.

            kandi-Security Security

              jmap has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              jmap code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              jmap is licensed under the Apache-2.0 License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              jmap releases are not available. You will need to build from source code and install.
              Deployable package is available in Maven.
              Build file is available. You can build the component from source.
              Installation instructions are not available. Examples and code snippets are available.
              jmap saves you 6886 person hours of effort in developing the same functionality from scratch.
              It has 22314 lines of code, 1516 functions and 423 files.
              It has low code complexity. Code complexity directly impacts maintainability of the code.

            Top functions reviewed by kandi - BETA

            kandi has reviewed jmap and discovered the below as its top functions. This is intended to give you an instant insight into jmap implemented functionality, and help decide if they suit your requirements.
            • Resolves the thread ids
            • Called by the synchronized methods
            • Completes changes to send changes
            • Calculate change state response
            • Handles getMail method response
            • Handles push subscription call
            • Resolves the email
            • Execute set mailbox response
            • Determines if a method call is sent
            • Handles send email
            • Create a type adapter for the given type token
            • Loads the entity to filter condition map
            • Creates a bi - map for the given type
            • Serialize an Invocation
            • Parse the given body into a list of Block objects
            • Returns the object that represents the query result
            • Performs an initial query
            • Gets the namespaces declared in the given method call
            • Process Jmap capabilities
            • Add a query result to the cache
            • Serialize a single message
            • Process Jmap AccountCapability
            • Deserialize a JSON message
            • Decode a JSON document to retrieve a result reference
            • Dispatch method calls
            • Registers the given GsonBuilder
            • Process create email method
            • Deserialize an invocation
            • This method processes the given round environment
            Get all kandi verified functions for this library.

            jmap Key Features

            No Key Features are available at this moment for jmap.

            jmap Examples and Code Snippets

            jmap-client
            Javadot img1Lines of Code : 51dot img1License : Permissive (Apache-2.0)
            copy iconCopy
            implementation 'rs.ltt.jmap:jmap-client:0.7.4'
            
            
              rs.ltt.jmap
              jmap-client
              0.7.4
            
            
            JmapClient client = new JmapClient("user@example.com", "password");
            
            Session session = client.getSession().get();
            String accountId = session.getPrimaryAccount(Mail  
            jmap-mua
            Javadot img2Lines of Code : 6dot img2License : Permissive (Apache-2.0)
            copy iconCopy
            implementation 'rs.ltt.jmap:jmap-mua:0.7.4'
            
            
              rs.ltt.jmap
              jmap-mua
              0.7.4
            
              

            Community Discussions

            QUESTION

            Codable Swift Structs for JSON with Nested Empty Array
            Asked 2022-Mar-06 at 07:23

            I have the following Swift code with some sample JSON that I'm trying to decode. You can drop this into a Playground to try it for yourself:

            ...

            ANSWER

            Answered 2022-Mar-06 at 07:23

            Your JMAPResponseChild is decoding an array expecting either a String or JMAPMethodResponse. The array looks like this:

            Source https://stackoverflow.com/questions/71367995

            QUESTION

            fast heap dumps but on out of memory
            Asked 2022-Jan-21 at 17:58

            We all know good old flag +HeapDumpOnOutOfMemoryError for taking heap dumps when JVM runs out of memory. Problem with this is that for large heaps this takes more and more time.

            There is a way to take fast heap dumps using GNU Debugger... You effectively take the core file of the process (very fast) then convert it to heapdump format using jmap... this is the slowest part of the work.

            However this is only if you take it manually, when your java apps run in containers there is usually a fixed timeout until your app will be killed non gracefully... for kube i believe it is 30 seconds by default.

            For many reasons i do not want to extend this timeout to larger number. Is there a way to trigger only core file dump when out of java runs out of memory? or we are just limited with whatever +HeapDumpOnOutOfMemoryError flag offers?

            ...

            ANSWER

            Answered 2022-Jan-21 at 17:58

            I can think of 2 possible solutions but it wont be only for out of memory situations but crashes too:

            1. You can use java's -XX:OnError option to run your own script or gcore, (gdb) generate-core-file(depends to your OS) to create an core dump that you can later use a debugger(like gdb) to attach to it.

            2. You can enable auto core dumps in your OS in the way it provides. For Redhat:

            To enable: Edit the related line in file /etc/systemd/system.conf as DefaultLimitCORE=infinity

            Reboot and remove the limits of core dump by ulimit -c unlimited.

            When your application crashes, the dumb must be created in its working directory.

            Source https://stackoverflow.com/questions/70804785

            QUESTION

            why the MaxHeapSize values are different between java -XX:+PrintFlagsFinal and jinfo -flag MaxHeapSize
            Asked 2022-Jan-14 at 05:10

            I'm running my java application on apline linux system in docker container, and I wanna find out the value of MaxHeapSize, so I use several command : java -XX:+PrintFlagsFinal, jinfo -flag MaxHeapSize , jmap -heap, but the output made me feel confused. The output of jinfo -flag MaxHeapSize , jmap -heap are consistent. However, The output of java -XX:+PrintFlagsFinal is different.so why did this happen?

            The default container memory Limit setting is 4096MiB.

            enter image description here

            The output of java commonds is shown below.(I marked some important parts in the picture)

            ...

            ANSWER

            Answered 2022-Jan-14 at 05:10

            These are not comparing the same thing.

            When running jmap or jstack, these attach to the existing process with PID 9, as listed in the first jps command.

            When running java -XX:+PrintFlagsFinal -version, this creates a new JVM process, and prints the information for that new process. Note that the original PID 9 process has a number of additional flags that can affect the calculated heap size.

            For a more accurate comparison, you could add the -XX:+PrintFlagsFinal flags to the main command run when the container starts. I would expect this to match the values returned by jinfo and jmap.

            Source https://stackoverflow.com/questions/70706125

            QUESTION

            Why my JVM has so many old char and string?
            Asked 2021-Nov-30 at 02:47

            jmap -histo {pid} shows the following result:

            ...

            ANSWER

            Answered 2021-Nov-30 at 02:47

            As @boneill points out, under the hood jmap -histo:live performs a full GC ... to determine what objects are live. And jmap -histo ... doesn't.

            Why my JVM has so many old char and string?

            Is this normal or do I need to concern?

            It is hard to say. There is insufficient evidence.

            But, without other evidence, I'd say "not concerning".

            where are the other 860M Chars?

            First of all [C doesn't mean Char. It means char[].

            Where are they? Well my reading is that they are unreachable. (Not live). They are candidates for garbage collection.

            ... and why they aren't be GC?

            Because the GC hasn't collected them yet.

            Java garbage collection is ... complicated. Many of the collectors are generational meaning that they split the heap into new and old object spaces. The new space is collected frequently. The old space is collected infrequently. So if most of those objects have been tenured to the old space, they may life a relatively long time after they have become unreachable.

            That is one possible explanation.

            When will these Chars be GC?

            When the old space is collected. Probably.

            How can I make them immediately GC to save memory?

            You could call System.gc() to ask the JVM to run a (typically) full garbage collection. But ...

            1. the JVM may ignore that request entirely,
            2. it might not run a full GC (that's possibly implementation dependent),
            3. even if the objects are collected, you most likely won't save any actual memory.

            Why don't you save memory? Because the JVM hangs on to the free space it got back ... ready to allocate new objects. So the memory is not returned to the OS for other applications to use. (There is some complicated logic for heap resizing, but as a rule the JVM gives back memory reluctantly; i.e. only after a number of full GC cycles.)

            Finally, calling System.gc() in your application code is bad for performance ... in most circumstances. There are other Q&As that explain why.

            Source https://stackoverflow.com/questions/70162808

            QUESTION

            CMS GC - How to profile young gen heap?
            Asked 2021-Nov-28 at 11:00

            I'm able to use jmap command to dump JVM memory heap.

            The issue is, I have a program with heavier young gen GC activities compared to the previous version when checking from the GC logs, and when I ran memory profiler, the biggest objects are always the ones in the old gen. So it makes troubleshooting more difficult when you need to find the leaks that exist in young gen GC.

            Is there any way to profile the memory in the young gen heap?

            Updated: I used open JDK 1.8.

            ...

            ANSWER

            Answered 2021-Nov-28 at 11:00

            The profiling interface of the JVM does not provide GC-specific information, so profilers cannot tell you what GC generation an object is in.

            However, some profilers have the ability to record how old an object is (effectively making their own "generations") so you can restrict your analysis to younger objects only. JProfiler, for example has a "Set mark" action that marks all objects in the heap.

            After you create a heap dump, you can select objects that have been created after the mark action was invoked.

            If you choose to record allocation times, you can select objects created in arbitrary time intervals in the "Time" view of the heap walker.

            Disclaimer: My company develops JProfiler

            Source https://stackoverflow.com/questions/70124953

            QUESTION

            Installing jenkins on Linux Mint 20.2
            Asked 2021-Nov-26 at 06:56

            I've Linux Mint 20.2 Cinnamon and I tried to install jenkins. Detailed steps for installation is as below:

            1. Installing java - installed via apt

            ...

            ANSWER

            Answered 2021-Nov-26 at 06:56

            jenkins will work with java 8 on mint 20 and 21. If you have different java versions installed on your system then select the jdk8 as default by

            Source https://stackoverflow.com/questions/70107177

            QUESTION

            How to capture application monitoring information from the docker container
            Asked 2021-Aug-31 at 16:20

            I have more than one java application running in separate docker containers. I am trying to collect monitoring data such as GC log, thread dump, heap dump from the java process running inside a container using tools like jstat, jstack, jmap. Is it possible to capture this information from the host(outside containers)?

            I am new to the containerized world. I understand that PID namespace of the host and container is different. When I execute jstack > thread_dump.txt from the host, it shows error message: Unable to open socket file /proc/root/tmp/.java_pid: target process doesn't respond within 10500ms or HotSpot VM not loaded

            Where PID is process id from the host PID namespace.

            When I execute jstack inside container ( docker exec -it ) then it is able to capture thread dump.

            Where PID is process id from the container PID namespace.

            Any hints on how to solve this?

            ...

            ANSWER

            Answered 2021-Aug-31 at 13:17

            The command you should use is:

            Source https://stackoverflow.com/questions/68999346

            QUESTION

            Commands like jps, jstat, jstack, etc show " not found"
            Asked 2021-Jun-02 at 18:08

            I am running Tomcat 9 on an Ubuntu 20.04 OS using OpenJDK 64-Bit Server VM (build 25.275-b01, mixed mode). When I try to gather diagnostics info using jstat, jstack, etc, I see PID not found. jps also cannot identify the Tomcat process id.

            I have checked several posts like one, two, three, four, etc, but none of the answers given in these helped me to solve my problem!

            Even though I am passing the username with which the Tomcat process is running, jstat cannot find that process: sudo -u tomcat jstat -gc 476174 5000

            In case it matters:

            1. I can see that the Tomcat process is started with -Djava.io.tmpdir=/tmp This folder is owned by root user but has full permissions(777) enabled.
            2. When the Tomcat process is started, I can see a folder with name systemd-private-e6d8b5dc224848f8a64a3e943ac2e9c4-tomcat9.service-UH5knj (the last few chars after service- change every time the process is restarted) getting created with owner as root (probably because I start tomcat service using sudo service tomcat9 start) and this folder has permission of rwx------.

            Any hints on how to solve this issue?

            Thanks, Shobhana

            ...

            ANSWER

            Answered 2021-Feb-09 at 20:58

            All these tools (jstack, jmap, jstat...) rely on the communication with the target JVM through /tmp directory.

            Apparently Tomcat runs in a different mount namespace, so that its /tmp directory is not the same as /tmp of the current shell. To verify this, run

            Source https://stackoverflow.com/questions/66100459

            QUESTION

            Working with Google Analytics GA4 in Delphi 10.4.2
            Asked 2021-May-28 at 04:22

            I'm trying to send events from my mobile application to Google analytics. External library connected: com-google-android-gms.play-services-analytics-impl.16.0.8.jar Androidapi.JNI.PlayServices

            After launching the application, I get the following.

            ...

            ANSWER

            Answered 2021-Apr-23 at 13:32

            After digging around in the documentation. GoogleAnalytics I found this.

            This code is used for universal analytics not GA4 so if you are trying to use this to send data to GA4 its not going to work.

            Source https://stackoverflow.com/questions/67230609

            QUESTION

            jmap -heap cause jvm crash
            Asked 2021-May-27 at 00:37
            QA

            when we execute jmap -heap pid , the target java process can't handle any http request.

            env ...

            ANSWER

            Answered 2021-May-27 at 00:37

            we had received some warning about ECS from aliyun once, so we upgraded some patch.

            from that, we found some software that be influenced, like glibc, then we upgrade glibc and jmap worked

            Source https://stackoverflow.com/questions/67499863

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

            Vulnerabilities

            No vulnerabilities reported

            Install jmap

            You can download it from GitHub, Maven.
            You can use jmap like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the jmap component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .

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            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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