features-extract-error

[sincerity-being]

javac -cp extractor/target/features-javac-extractor-1.0.0-SNAPSHOT-jar-with-dependencies.jar -Xplugin:FeaturePlugin QueueDrainObserver.java:2: 错误: 找不到符号 protected final void fastPathOrderedEmit(U value, boolean delayError, Disposable disposable) { ^ 符号: 类 U 位置: 类 QueueDrainObserver QueueDrainObserver.java:2: 错误: 找不到符号 protected final void fastPathOrderedEmit(U value, boolean delayError, Disposable disposable) { ^ 符号: 类 Disposable 位置: 类 QueueDrainObserver QueueDrainObserver.java:3: 错误: 找不到符号 final Observer<? super V> observer = downstream; ^ 符号: 类 Observer 位置: 类 QueueDrainObserver QueueDrainObserver.java:3: 错误: 找不到符号 final Observer<? super V> observer = downstream; ^ 符号: 类 V 位置: 类 QueueDrainObserver QueueDrainObserver.java:3: 错误: 找不到符号 final Observer<? super V> observer = downstream; ^ 符号: 变量 downstream 位置: 类 QueueDrainObserver QueueDrainObserver.java:4: 错误: 找不到符号 final SimplePlainQueue<U> q = queue; ^ 符号: 类 SimplePlainQueue 位置: 类 QueueDrainObserver QueueDrainObserver.java:4: 错误: 找不到符号 final SimplePlainQueue<U> q = queue; ^ 符号: 类 U 位置: 类 QueueDrainObserver QueueDrainObserver.java:4: 错误: 找不到符号 final SimplePlainQueue<U> q = queue; ^ 符号: 变量 queue 位置: 类 QueueDrainObserver QueueDrainObserver.java:6: 错误: 找不到符号 if (wip.get() == 0 && wip.compareAndSet(0, 1)) { ^ 符号: 变量 wip 位置: 类 QueueDrainObserver QueueDrainObserver.java:6: 错误: 找不到符号 if (wip.get() == 0 && wip.compareAndSet(0, 1)) { ^ 符号: 变量 wip 位置: 类 QueueDrainObserver QueueDrainObserver.java:9: 错误: 找不到符号 if (leave(-1) == 0) { ^ 符号: 方法 leave(int) 位置: 类 QueueDrainObserver QueueDrainObserver.java:17: 错误: 找不到符号 if (!enter()) { ^ 符号: 方法 enter() 位置: 类 QueueDrainObserver QueueDrainObserver.java:21: 错误: 找不到符号 QueueDrainHelper.drainLoop(q, observer, delayError, disposable, this); ^ 符号: 变量 QueueDrainHelper 位置: 类 QueueDrainObserver WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.google.protobuf.UnsafeUtil (file:/D:/code/paper_impl_and_git_code/myself/pyBKT/hey/ast_deal/features-javac/extractor/target/features-javac-extractor-1.0.0-SNAPSHOT-jar-with-dependencies.jar) to field java.nio.Buffer.address WARNING: Please consider reporting this to the maintainers of com.google.protobuf.UnsafeUtil WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Feature extraction failed: QueueDrainObserver.java

May I be able to extract such a Java file with only a class name and one method, while not importing any packages, but the method references a certain class.