list of preferable Intellij plugins
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Advanced Java Folding https://plugins.jetbrains.com/plugin/9320-advanced-java-folding
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CodeGlance https://plugins.jetbrains.com/plugin/7275-codeglance
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FindBugs https://plugins.jetbrains.com/plugin/3847-findbugs-idea
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SonarLint https://plugins.jetbrains.com/plugin/7973-sonarlint
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Lombok plugin for Intellij https://github.com/mplushnikov/lombok-intellij-plugin
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Quick Notes https://plugins.jetbrains.com/plugin/4456-quick-notes
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Key promoter https://plugins.jetbrains.com/plugin/9792-key-promoter-x