---------* WARNING! Automatic page file configuration detected. It is recommended that you disable swap when running Cassandra for performance and stability reasons. *

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我在Windows10上的Cassandra3.11.7中遇到了同样的问题，并通过正确设置java\ u home解决了这个问题。我发现java\u home应该指向“bin”的父级，例如指向“c:\program files\java\jre1.8.0\u 261”，而不是指向“c:\program files\java\jre1.8.0\u 261\bin”。这解决了“系统找不到指定的路径”错误
学分：https://github.com/elastic/elasticsearch/issues/2274

---------* WARNING! Detected a power profile other than High Performance. Performance of this node will suffer. Modify conf\cassandra.env.ps1 to suppress this warning. *

---------* Exception calling "Start" with "0" argument(s): "The system cannot find the file specified" At C:\cassandra\conf\cassandra-env.ps1:212 char:5 + $p.Start() | Out-Null + ~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : NotSpecified: (:) [], MethodInvocationException + FullyQualifiedErrorId : Win32Exception Exception calling "WaitForExit" with "0" argument(s): "No process is associated with this object." At C:\cassandra\conf\cassandra-env.ps1:213 char:5 + $p.WaitForExit() + ~~~~~~~~~~~~~~~~ + CategoryInfo : NotSpecified: (:) [], MethodInvocationException + FullyQualifiedErrorId : InvalidOperationException You cannot call a method on a null-valued expression. At C:\cassandra\conf\cassandra-env.ps1:214 char:5 + $stderr = $p.StandardError.ReadToEnd() + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : InvalidOperation: (:) [], RuntimeException + FullyQualifiedErrorId : InvokeMethodOnNull You cannot call a method on a null-valued expression. At C:\cassandra\conf\cassandra-env.ps1:218 char:9 + if ($stderr.Contains("Error")) + ~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : InvalidOperation: (:) [], RuntimeException + FullyQualifiedErrorId : InvokeMethodOnNull You cannot call a method on a null-valued expression. At C:\cassandra\conf\cassandra-env.ps1:231 char:5 + $sa = $stderr.Split("""") + ~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : InvalidOperation: (:) [], RuntimeException + FullyQualifiedErrorId : InvokeMethodOnNull Cannot index into a null array. At C:\cassandra\conf\cassandra-env.ps1:232 char:5 + $env:JVM_VERSION = $sa[1] + ~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : InvalidOperation: (:) [], RuntimeException + FullyQualifiedErrorId : NullArray You cannot call a method on a null-valued expression. At C:\cassandra\conf\cassandra-env.ps1:234 char:9 + if ($stderr.Contains("OpenJDK")) + ~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : InvalidOperation: (:) [], RuntimeException + FullyQualifiedErrorId : InvokeMethodOnNull Cannot index into a null array. At C:\cassandra\conf\cassandra-env.ps1:247 char:5 + $pa = $sa[1].Split("_") + ~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : InvalidOperation: (:) [], RuntimeException + FullyQualifiedErrorId : NullArray Cannot index into a null array. At C:\cassandra\conf\cassandra-env.ps1:248 char:5 + $subVersion = $pa[1] + ~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : InvalidOperation: (:) [], RuntimeException + FullyQualifiedErrorId : NullArray *

所以这条线看起来好像失败了：

if ($env:JVM_VERSION.CompareTo("1.8.0") -eq -1

当我在centos（linux）上运行时 java -version ，我看到以下输出：

$ java -version
openjdk version "1.8.0_191"
OpenJDK Runtime Environment (build 1.8.0_191-b12)
OpenJDK 64-Bit Server VM (build 25.191-b12, mixed mode)

如您所见，第一行的版本以某种格式返回“1.8.0¿”
关于这一点有两点：
我不知道它的产量是多少 java -version 显示了Java12，但是我知道对于一些jdk供应商，格式是不同的。例如，adoptopenjdk部署会导致cassandra 4.0出现问题（根据jira：https://issues.apache.org/jira/browse/cassandra-14926).
cassandra版本3（及之前版本）仅适用于Java8。Cassandra4（尚未发布）最多支持Java11。好吧，Java12还没有出现在路线图上。
当然，我会安装一个较低版本的java。如果您使用的是cassandra3，那么应该安装java8的最新补丁。
如果您仍然有问题，我将从cassandra-env.ps1文件中删除java版本检查。尽管如此，你这样做是在你自己的危险。

---------* You cannot call a method on a null-valued expression. At C:\cassandra\conf\cassandra-env.ps1:406 char:9 + if ($env:JVM_VERSION.CompareTo("1.8.0") -eq -1 -or [convert]::ToI ... + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : InvalidOperation: (:) [], RuntimeException + FullyQualifiedErrorId : InvokeMethodOnNull Exception calling "Start" with "0" argument(s): "The system cannot find the file specified" At C:\cassandra\bin\cassandra.ps1:251 char:9 + $p.Start() | Out-Null + ~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : NotSpecified: (:) [], MethodInvocationException + FullyQualifiedErrorId : Win32Exception Exception calling "WaitForExit" with "0" argument(s): "No process is associated with this object." At C:\cassandra\bin\cassandra.ps1:253 char:9 + $p.WaitForExit() + ~~~~~~~~~~~~~~~~ + CategoryInfo : NotSpecified: (:) [], MethodInvocationException + FullyQualifiedErrorId : InvalidOperationException`

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