Logstash does not support Java 15 yet, there is an open issue about it, but you won't be able to use Java 15 to run logstash until support is available.
You will need to use another Java version, currently logstash supports Java 8, Java 11 or Java 14.
You can also unset the JAVA_HOME
environment variable and logstash will use its bundled java, which is AdoptOpenJDK 11.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…