SQL developer download - unable to connect

Hello, I'm a beginner at Oracle SQL developer. I just downloaded the sql developer 3.2.20.09.87 one which includes zip file JDK. However it is not letting me connect. This is the error I'm getting.
failure- test failed: IO error: The network adapter could not establish the connection.
How do I fix it.

Welcome to the forum!
>
Hello, I'm a beginner at Oracle SQL developer. I just downloaded the sql developer 3.2.20.09.87 one which includes zip file JDK. However it is not letting me connect. This is the error I'm getting.
failure- test failed: IO error: The network adapter could not establish the connection.
How do I fix it.
>
How would we know? That's about the same as saying 'help, my car won't start. why won't my car start?'. Maybe you didn't put it in park, maybe you didn't put the key in the ignition, maybe you dont' have any gas. How would we know?
You have to provide detailed information about
1. what you are doing
2. how you are doing it
3. any errors or messages you are getting.
All you did is provide #3.
What are you doing? What database and version are you trying to connect to? What connection parameters did you use?

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So, checking what java is running:
C:\>java -version
java version "1.7.0_21"
Java(TM) SE Runtime Environment (build 1.7.0_21-b11)
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Dear,
I just finished my training for Oracle Financial Consultant, i need to download SQL Developer to learn and run the queries.
I am downloading from following link
http://www.oracle.com/technetwork/developer-tools/sql-developer/sqldev-ea-download-486950.html
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Oracle SQL Developer for 32-bit Windows (This zip file includes the JDK1.6.0_11)
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>
I would like to let my student use Oracle Sql Developer for training purposes in University lab. Can I share my downloaded copy in our course site, because for my it is difficult if they have to register an account into Oracle site and then download Oracle Sql Developer.
>
That is a question that only Oracle can answer.
>
Are there license issues? Thanks
>
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Exception initializing 'oracle.jdevimpl.runner.profile.ProfilerShell' in extension 'Database Developer': oracle.classloader.util.AnnotatedNoClassDefFo
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Missing class: oracle.jdevimpl.runner.profile.ProfArb
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Loader: ide-global:11.1.1.0.0
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at oracle.classloader.PolicyClassLoader.handleClassNotFound (PolicyClassLoader.java:2180) [/E:/sqldeveloper/modules/oracle.classloader_11.1.1.
jar (from system property java.class.path), by sun.misc.Launcher$AppClassLoader@24216257]
at oracle.classloader.PolicyClassLoader.internalLoadClass (PolicyClassLoader.java:1733) [/E:/sqldeveloper/modules/oracle.classloader_11.1.1.ja
r (from system property java.class.path), by sun.misc.Launcher$AppClassLoader@24216257]
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ar (from system property java.class.path), by sun.misc.Launcher$AppClassLoader@24216257]
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