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What are the key differences between Scala and Groovy? [closed]
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They're both object oriented languages for the JVM that have lambdas and closures and interoperate with Java. Other than that, they're extremely different.
Groovy is a "dynamic" language in not only the sense that it is dynamically typed but that it su...
explicit casting from super class to subclass
...piler is allowing the downcast when eventually it is going to throw a java.lang.ClassCastException?
The answer is that all the compiler can do is verify that the two types are in the same inheritance tree, so depending on whatever code might have
come before the downcast, it's possible that animal...
What exactly is nullptr?
... you use NULL or 0 (zero) for pointers in C++?
template
Google group: comp.lang.c++.moderated - compiler discussion
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How can I convert JSON to a HashMap using Gson?
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Here you go:
import java.lang.reflect.Type;
import com.google.gson.reflect.TypeToken;
Type type = new TypeToken<Map<String, String>>(){}.getType();
Map<String, String> myMap = gson.fromJson("{'k1':'apple','k2':'orange'}", type);
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What is a good use case for static import of methods?
...em individually.
(https://docs.oracle.com/javase/8/docs/technotes/guides/language/static-import.html)
There are two parts I want to call out specifically:
Use static imports only when you were tempted to "abuse inheritance". In this case, would you have been tempted to have BusinessObject exten...
Different ways of loading a file as an InputStream
...") will look for a file in your classpath at the following location: "java/lang/myfile.txt". If your path starts with a /, then it will be considered an absolute path, and will start searching from the root of the classpath. So calling String.class.getResourceAsStream("/myfile.txt") will look at the...
Do spurious wakeups in Java actually happen?
...tion as it is suggested in java doc docs.oracle.com/javase/6/docs/api/java/lang/… ?
– gumkins
Mar 18 '15 at 21:45
I ...
MySQL ON DUPLICATE KEY UPDATE for multiple rows insert in single query
...wered Apr 26 '10 at 15:26
Peter LangPeter Lang
49.3k2626 gold badges138138 silver badges152152 bronze badges
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Neither BindingResult nor plain target object for bean name available as request attribute [duplicat
...00% correct, but after starting the Tomcat, you receive an exception. java.lang.IllegalStateException: Neither BindingResult
I just removed and added again Tomcat configuration. And it worked for me.
A picture Tomcat configuration
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Spring Boot + JPA : Column name annotation ignored
...esh(AbstractApplicationContext.java:542)
- locked <0x1688> (a java.lang.Object)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:761)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:371)
at org.springframework.boot.SpringA...