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com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
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So, you have a
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
java.net.ConnectException: Connection refused
I'm quoting from this answer which also contains a step-by-step MySQL+JDBC tutorial:
If you get a SQLException: Conn...
Tomcat startup logs - SEVERE: Error filterStart how to get a stack trace?
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Siddharth
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answered Jun 10 '10 at 18:07
matt bmatt b
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How can I use tabs for indentation in IntelliJ IDEA?
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ROMANIA_engineerROMANIA_engineer
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What's the difference between Ruby's dup and clone methods?
...opies the singleton class, while dup does not.
o = Object.new
def o.foo
42
end
o.dup.foo # raises NoMethodError
o.clone.foo # returns 42
Second, clone preserves the frozen state, while dup does not.
class Foo
attr_accessor :bar
end
o = Foo.new
o.freeze
o.dup.bar = 10 # succeeds
o.clone...
Firebug-like debugger for Google Chrome
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242
There is a Firebug-like tool already built into Chrome. Just right click anywhere on a page and...
Bash script prints “Command Not Found” on empty lines
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answered Sep 9 '11 at 13:46
chownchown
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How to implement a binary tree?
...nt(str(node.v) + ' ')
self._printTree(node.r)
# 3
# 0 4
# 2 8
tree = Tree()
tree.add(3)
tree.add(4)
tree.add(0)
tree.add(8)
tree.add(2)
tree.printTree()
print(tree.find(3).v)
print(tree.find(10))
tree.deleteTree()
tree.printTree()
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How best to include other scripts?
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edited May 31 '14 at 9:21
nyuszika7h
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a...
How to read a text file into a list or an array with Python
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4 Answers
4
Active
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What is the difference between declarative and procedural programming paradigms?
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answered Oct 25 '09 at 2:54
community wiki
Ned ...