Created attachment 164863 [details]
nb/var/log/messages.log of a session with a freeze

After creating a Java class

```
package com.mycompany.loong.string.preview;

import org.apache.commons.lang3.RandomStringUtils;

public class NewClass {

    public static void main(String[] args) {
        int charCount = 1024*1024;
        String randomString = RandomStringUtils.random(charCount);
        System.out.println(randomString);
    }
}
```

and setting a breakpoint at line 10, hovering over `randomString` causes the UI to become unresponsive for ca. 2 minutes. Since longer strings are not unrealistic the freeze might be even longer.

The above example with dependencies can be found at https://github.com/krichter722/loong-string-preview.

experienced with dev-201707280001