javaUtils | sum up the util package in the Java language

 by   HJKCC Java Version: Current License: No License

kandi X-RAY | javaUtils Summary

kandi X-RAY | javaUtils Summary

javaUtils is a Java library. javaUtils has no bugs, it has no vulnerabilities, it has build file available and it has low support. You can download it from GitHub.

sum up the util package in the Java language.

            kandi-support Support

              javaUtils has a low active ecosystem.
              It has 29 star(s) with 2 fork(s). There are 2 watchers for this library.
              It had no major release in the last 6 months.
              javaUtils has no issues reported. There are no pull requests.
              It has a neutral sentiment in the developer community.
              The latest version of javaUtils is current.

            kandi-Quality Quality

              javaUtils has 0 bugs and 0 code smells.

            kandi-Security Security

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

            kandi-License License

              javaUtils does not have a standard license declared.
              Check the repository for any license declaration and review the terms closely.
              Without a license, all rights are reserved, and you cannot use the library in your applications.

            kandi-Reuse Reuse

              javaUtils releases are not available. You will need to build from source code and install.
              Build file is available. You can build the component from source.
              javaUtils saves you 1723 person hours of effort in developing the same functionality from scratch.
              It has 3815 lines of code, 382 functions and 19 files.
              It has high code complexity. Code complexity directly impacts maintainability of the code.

            Top functions reviewed by kandi - BETA

            kandi has reviewed javaUtils and discovered the below as its top functions. This is intended to give you an instant insight into javaUtils implemented functionality, and help decide if they suit your requirements.
            • Upload file
            • Upload directory
            • Set key value
            • Create a remote file
            • Upload directory
            • Parses parameters
            • Set redis
            • Get current date before date
            • Get the date before the given interval
            • Set object
            • Set an object
            • Get weekday list
            • Setex for key
            • Get scard
            • Returns the set difference
            • Get MD5 string
            • Get month date
            • Set a set of keys
            • Method to get the set of strings
            • Synchronized
            • Difference
            • Convert a txt file to a String
            • Parse log level
            • Sort the targetList
            • Convert time to seconds
            • Get server IP
            • Store string
            Get all kandi verified functions for this library.

            javaUtils Key Features

            No Key Features are available at this moment for javaUtils.

            javaUtils Examples and Code Snippets

            No Code Snippets are available at this moment for javaUtils.

            Community Discussions


            java.lang.NoClassDefFoundError: org/apache/hadoop/hive/ql/metadata/HiveException when query in spark-shell
            Asked 2021-May-24 at 03:46

            I’m trying to integrate spark(3.1.1) and hive local metastore (3.1.2) to use spark-sql.

            i configured the spark-defaults.conf according to and hive jar files exists in correct path.

            but an exception occurred when execute 'spark.sql("show tables").show' like below.

            any mistakes, hints, or corrections would be appreciated.



            Answered 2021-May-21 at 07:25

            Seems your hive conf is missing. To connect to hive metastore you need to copy the hive-site.xml file into spark/conf directory.




            spark submit java.lang.IllegalArgumentException: Can not create a Path from an empty string
            Asked 2021-May-04 at 06:03

            i am getting this error when i do spark submit. java.lang.IllegalArgumentException: Can not create a Path from an empty string i am using spark version 2.4.7 hadoop version 3.3.0 intellji ide jdk 8 first i was getting class not found error which i solved now i am getting this error Is it because of the dataset or something else. link to dataset




            Answered 2021-May-04 at 06:03

            It just seems as output_dir variable contains incorrect path:



            hive standalone metastore reading avro data with schema not working
            Asked 2020-Dec-15 at 20:43

            we have usecase of presto hive accessing s3 file present in avro format. When we try to use standalone hive-metastore and read this avro data using external table ,we are getting issue SerDeStorageSchemaReader class not found issue



            Answered 2020-Dec-15 at 20:43

            standalone hive doesnt support avro. we need to install full hadoop plus hive version and start only hive metastore to fix it



            Thread Pool task list update issue
            Asked 2019-Dec-31 at 04:44

            I am trying to design a thread pool at my end in java. As per my design I am using a java's Linkedlist DS inside a main runner thread class to hold on to all the submitted tasks. This task list is getting updated from the main class wherein the main class is adding a tasks to the task list. Inside my main runner thread I am running a while loop and constantly checking for whether the LinkedList is not empty , and if it contains a task then i am retrieving the task and executing it.

            The problem here is that I have added a task from my main method in to the task list and I can see the size of this task list to be 1 from main method but inside the runner thread when i print the size of task list object , it shows it as 0.

            Need help figuring out what exactly is happening here.



            Answered 2019-Dec-31 at 04:44

            I think there is a thread-safety problem. Specifically:

            1. a LinkedList is not thread-safe, and
            2. you are using the LinkedList object in rt.getTasks().size() without any synchronization.

            This is sufficient to cause size() to return a stale value under some circumstances.

            If you are going to rely on the semantics of volatile you need to do a proper analysis of the happens-before relationships for each write / read sequence that matters to thread safety. It is tricky.

            My advice would be:

            1. Don't use volatile. Use synchronized and/or an existing thread-safe data structure instead ... if you need to reinvent the wheel.

            2. Don't reinvent the wheel. You could replace your thread pool with a single call Executors.singleThreadExecutor; see javadoc.



            Java - Send SOAP header (for authentication)
            Asked 2018-Jul-26 at 23:14

            I've generated some Java code from a wsdl file and the request itself seems to be working, but I can't send my credentials.

            I've tested the Webservice with a tool called "SoapUI" and everything seemes to be working like a charm.

            Here is an example of the (working) xml:



            Answered 2018-Jul-25 at 09:09

            Your code looks good to me, so not sure where is actual problem. But rather then modifying stub class, I have done it while invoking the service method. Your code should look something like below and you could remove your code modifications to generated stub class, and it should work.



            Headless driver
            Asked 2018-Jul-16 at 08:57




            Answered 2018-Jul-16 at 08:51

            I used this code , and I am not getting any error. Output was Google

            Maybe you will have to download latest chrome driver , chrome browser version and Selenium.

            My config :

            Chrome: Version 67.0.3396.99 (Official Build) (64-bit)
            Selenium 3.12.0 (you can go for 3.13.0 also)
            Chrome driver : version 2.40

            Download links : Chrome_driver
            Selenium 3.13.0 Browser you can just upgrade.



            PySpark error java.lang.OutOfMemoryError: GC overhead limit exceeded
            Asked 2018-Mar-15 at 09:33

            How can I fix my GC overhead limit exceeded happening with PySpark version 2.2.1. installed on Ubuntu 16.04.4.

            Inside the Python 3.5.2 script I setup spark as:



            Answered 2018-Mar-15 at 09:33

            Taking straight from the docs,

            • The first step in GC tuning is to collect statistics on how frequently garbage collection occurs and the amount of time spent GC. This can be done by adding -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCTimeStamps to the Java options.
            • The goal of GC tuning in Spark is to ensure that only long-lived RDDs are stored in the Old generation and that the Young generation is sufficiently sized to store short-lived objects. This will help avoid full GCs to collect temporary objects created during task execution.
            • Check if there are too many garbage collections by collecting GC stats. If a full GC is invoked multiple times for before a task completes, it means that there isn’t enough memory available for executing tasks.
            • If there are too many minor collections but not many major GCs, allocating more memory for Eden would help. You can set the size of the Eden to be an over-estimate of how much memory each task will need. If the size of Eden is determined to be E, then you can set the size of the Young generation using the option -Xmn=4/3*E. (The scaling up by 4/3 is to account for space used by survivor regions as well.)
            • In the GC stats that are printed, if the OldGen is close to being full, reduce the amount of memory used for caching by lowering spark.memory.fraction; it is better to cache fewer objects than to slow down task execution. Alternatively, consider decreasing the size of the Young generation. This means lowering -Xmn if you’ve set it as above. If not, try changing the value of the JVM’s NewRatio parameter. Many JVMs default this to 2, meaning that the Old generation occupies 2/3 of the heap. It should be large enough such that this fraction exceeds spark.memory.fraction.
            • Try the G1GC garbage collector with -XX:+UseG1GC. It can improve performance in some situations where garbage collection is a bottleneck. (This helped me)

            Some more parameters that helped me were,

            • -XX:ConcGCThreads=20
            • -XX:InitiatingHeapOcuupancyPercent=35

            All GC tuning flags for executors can be specified by setting spark.executor.extraJavaOptions in a job’s configuration.

            Check this out for further details.


            In you spark-defaults.conf write,

            spark.executor.JavaOptions -XX:+UseG1GC

            spark.executor.extraJavaOptions -XX:ConcGCThreads=20 -XX:InitiatingHeapOcuupancyPercent=35



            Axis 1.4 can't deserialize response
            Asked 2017-Apr-25 at 20:18

            I'm implement a client that access an old service, after some researches I discovered I need user Axis 1.4 do comunicate with this service. After generate the java code from wsdl I can see that Axis is not deserializing the response corretly, it appears it is reading the element as if it was another.

            This is de wsdl of the service:



            Answered 2017-Apr-25 at 20:18

            I tried implement the client using JAX-RPC however I got the same error. Tried modify the way the client was processing the response, but I was getting some other errors. So I gave up use third part SOAP clients and implemented a http client sending and receiving the data as String:


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


            No vulnerabilities reported

            Install javaUtils

            You can download it from GitHub.
            You can use javaUtils 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 javaUtils 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 For Gradle installation, please refer .


            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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