I’m trying to accomplish a multipart file upload using feign, but I can’t seem to find a good example of it anywhere. I essentially want the HTTP request to turn out similar to this: Or even… Do I need to manually build the request body, including generating the multipart boundaries? That se…
A utility method representing, “Both not null and not equal” in Java
Comparing this string variable like the following. In case str is null, it will cause a java.lang.NullPointerException to be thrown as obvious. To avoid that, an additional null check may be enforced. Such as, I find it plain ugly. Better could be rewritten as follows. This will never throw a java.lang.NullPo…
Calculate Xmx setting and actual heap size from Java dump
I’ve got a heap dump file (java_dump.hprof) written by a Java 7 JVM. Is it somehow possible to calculate the Xmx command line option as well as the actual heap size from this dump? Answer The dump is based on the size actually used but in a different format so it could be bigger. If the dump was trigger…
How to remove the brackets [ ] from ArrayList#toString()?
I have created an Array List in Java that looks something like this: When I print errors I get it errors as [1,2,3,4,5,6,7,8,9] Now I want to remove the brackets([ ]) from this array list. I thought I could use the method errors.remove(“[“), but then I discovered that it is just boolean and displa…
Intellij-idea reverse paste into string (aka copy from string)?
In Intellij idea if you paste some text into a string literal (between double quotes) the java editor can automatically reformat the pasted text – ie to place necessary escaping characters for double quotes new lines etc. I want to do reverse, ie when copying text from inside a string literal the editor…
How to update xml files in java
I have a xml file call data.xml like the code below. The project can run from client side no problem and it can read the xml file. The problem I have now is I I want to write a function that can update the startdate and enddate. I have no idea how to get start. Help will be appreciated. my
How to convert this Java code in C# code?
I tried to convert my Java code in C# but I missed something. Java code public Map getData() { return data; } public void setDataCarriers(Map
Hibernate : self join confusion?
I have a category table.In which first 5 are main category and others are sub category. I need to fetch the sub categories of first 5 main category so i have found the sql query The query is joining the same table itself.and am getting the result given below Result How can i convert the SQL query to HQL and
Unable to local MySQL database with Spring app deployed through Tomcat
I’m trying to create a web application using Spring and Hibernate, deploying it through Tomcat 8. I’ve setup MySQL and Tomcat 8 locally on my machine, and am able to deploy the web application to it. …
Pdf Renderer API Android From URL
I am looking into the PDF renderer API native to Google Android development. I see the following code example in the documentation: I think this example uses from File Object. How I can get this API to work with a URL from a webserver, such as a document from a website? How can I load a PDF natively in an