Java – Using the Eclipse remote debugger throws com.sun.jdi.InternalException

debuggingeclipsejava

The following error is being thrown:

com.sun.jdi.InternalException: Got error code in reply:35 occurred while retrieving value. for all expressions

I am getting this error for all expressions and cant find anything on it. My guess is that the debugger isn't correctly connecting to the remote version, but I am not sure.

Best Solution

It looks like the problem is related to the new debug feature "Show method result after a step operation": See the thread Eclipse Oxygen - Debugging Issue on the Eclipse forum:

The workaround is to go to Preferences -> Java -> Debug and disable the option "Show method result after a step operation (if supported by the VM; may be slow)".

See also the bug report in the Eclipse Bugzilla Bug 531706 - Oygen.2 com.sun.jdi.InternalException: Got error code in reply:35 while debugging

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Java – What are the differences between a HashMap and a Hashtable in Java

There are several differences between HashMap and Hashtable in Java:

Hashtable is synchronized, whereas HashMap is not. This makes HashMap better for non-threaded applications, as unsynchronized Objects typically perform better than synchronized ones.
Hashtable does not allow null keys or values. HashMap allows one null key and any number of null values.
One of HashMap's subclasses is LinkedHashMap, so in the event that you'd want predictable iteration order (which is insertion order by default), you could easily swap out the HashMap for a LinkedHashMap. This wouldn't be as easy if you were using Hashtable.

Since synchronization is not an issue for you, I'd recommend HashMap. If synchronization becomes an issue, you may also look at ConcurrentHashMap.

Java – the difference between public, protected, package-private and private in Java

The official tutorial may be of some use to you.

	Class	Package	Subclass (same pkg)	Subclass (diff pkg)	World
`public`	+	+	+	+	+
`protected`	+	+	+	+
no modifier	+	+	+
`private`	+

+ : accessible
blank : not accessible

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Java – What are the differences between a HashMap and a Hashtable in Java

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