I have this REST response: And this POJO: I’m using Spring RestTemplate with MappingJackson2HttpMessageConverter. With response above, prevValue is deserialized as a String like 1.0104401E7, in scientific notation. I want it to be deserialized without scientific notation. Is there a way to do this using…
HtmlUnit Scraping Xpath from Div
I am trying to scrape the contents of the google movies page, i want the name of the theater, the address and the time. As you can see in the google movie page each block of that information is inside …
Difference between @Bean and @Autowired
Why can’t I use @Autowired in this case? but can use @Bean Aren’t the two ways to generate BookingService the same thing? Answer @Bean and @Autowired do two very different things. The other answers here explain in a little more detail, but at a simpler level: @Bean tells Spring ‘here is an i…
Spring Boot classpath
In the Spring Boot’s docs here, about serving static content, it says: By default Spring Boot will serve static content from a directory called /static (or /public or /resources or /META-INF/resources) in the classpath. I found that all the content in the directory: will be copied inside the classpath, …
Why is Git Bash not using the correct Java path as defined in the PATH environment variable?
In an instance of Git Bash, typing in java -version gives me: Error: could not open ‘C:Program Files (x86)Javajre7libi386jvm.cfg’ However, my actual Java path is in D:Program FilesJavajdk1.8.0_45bin. This is shown in my %PATH% variable if I type in either echo $PATH or env | grep PATH. Where is Gi…
Java async MySQL queries
First of all, I don’t have much experience with thread safe programming. I have a MySQL class, and I want to use one instance in multiple threads to prevent blocking code in the main thread. I read about connection pooling but I want to keep it as simple as it is. This is my MySQL class: Is it possible …
java8 possibility to apply mathematical operators to functions
Assume, I’ve got two functions. I want to multiply these functions. So I want to get this lambda expression as a result: Is it possible in Java 8? Answer No, you won’t be able to do that with Function. Suppose you have a Function.multiply(other) method, what would be the result of performing multi…
loadOnStartup SEVERE: Servlet [dispatcher] in web application [/Producer] threw load() exception java.lang.NoSuchMethodError
I have a problem with setting up spring context using Eclipse + tomcat 8. I have checked several “Hello world” spring manuals and do not understand what is going wrong. I have the following error in console: Answer Somewhere in your classpath you have old Spring lib. AnnotationUtils from 4.2.1 con…
Fixed length 64 Bytes EC P-256 Signature with JCE
I need a fixed length 64 Byte ECDSA signature with the NIST P-256 Curve. The implementation hast to use JCE. The following code sample can generate a signature and verify it. Provider provSign = …
Reading excel file columns based on header in Spring Batch
We have requirement to read the huge excel file in java. I am prefering Spring Batch for same ,as we have spring already in project. However, we have one bottleneck that this excel file can have different columns, user can change the order of columns . So, we have to identify which column has what data from f…