I want to scan/query the dynamo DB table. Dynamo DB is case sensitive. I want to use Hash/ Range keys sometimes as strings. Is there any way we can enable case insensitivity in dynamo DB level ? Or is there any other solutions exist? I am querying the Dynamo with the JAVA SDK Answer There are 2 possible ways …
How to validate CronSequenceGenerator cron expressions?
How could I validate cron expressions that are prepared for use of CronSequenceGenerator? I mean, I cannot wait until the cron executes automatically as I’m defining like monthly intervals. Is the following correct? How can I be sure? Answer The Spring’s CronSequenceGenerator class has a method is…
Different results reading file with Files.newBufferedReader() and constructing readers directly
It seems that Files.newBufferedReader() is more strict about UTF-8 than the naive alternative. If I create a file with a single byte 128—so, not a valid UTF-8 character—it will happily be read if I construct an BufferedReader on an InputStreamReader on the result of Files.newInputStream(), but wit…
Insert Dimensions to complete Expression/ReferenceType
I’m a newbie to Java. I have provided a short snippet from my code for BFS. According to Eclipse, I have an error on each of the last 4 lines. Syntax Error: insert “Dimensions” to complete expression/referencetype. I would appreciate any input/advice! Answer Cause of this error -You are tryi…
Invalid signature file digest for Manifest main attributes exception while trying to run jar file
I am trying to run the jar file of my project. I am working on intelliJ and have use artifacts to generate the jar file. But everytime i am trying to run my jar file its giving me exception. And this is my manifest file: The project’s external libraries: Answer Some of your dependency JARs is a signed J…
Integrating JaCoCo, Arquillian and REST Assured brings me a code coverage of 0%
I’m using JaCoCo, Arquillian and rest-assured to test my RESTFul API. The problem is that I’m getting a 0% code coverage within my JaCoCo report. I’m using a maven profile for test cases, getting a wildfly instance, deploying it on JVM, deploying my API and then running the tests. I’ve…
How to handle transactions with concurrent access in Spring
I have a service with one method: And I’m running Gatling with 2 parallel calls config with testModelId = 1L argument. As a result of these calls I’m getting error: What I can see from logs is that two calls have entered this method at once and each printed log I assumed that adding transaction an…
setImageResource() with attrs value
I’m trying to put an image to my ImageView, with a custom attribute defined by me, I’m doing it this way: Attrs: ImageView Attrs: Than in my View: And set the image to the ImageView with: But nothing appears, I’ve tried also with: And: UPDATE: I’ve already tried to parse attribute with…
How do I configure PostgreSQL with Grails 3.0?
I am using IntelliJ IDEA 15.0.2 as an IDE. I have created a Grails 3.0 application and changed it a bit to configure PostgreSQL. Here is my dataSource: And in my build.gradle I added runtime “postgresql:postgresql:9.4-1207.jdbc4”. But that gives errors when I run: What have I missed? Answer Data s…
Jackson – Custom TypeId Resolver
I’ve been using a custom typeId resolver for one of my classes, so far I’ve been leaning on the annotation support: But now I need to customize the creation of the type resolver by passing some other dependencies to it via constructor or setters, and since Jackson is the one who instantiate it I c…