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adb android java shell

Running shell commands on Android using Runtime.getRuntime

I am working on a device admin app (has been signed by the manufacturer). I am using it to install other apps using the below adb shell command for android 9 :-

cat /sdcard/Download/myfolder/newapp.apk | pm install -S 1528293

and I am just passing it like this:-

String command = "cat /sdcard/Download/myfolder/newapp.apk | pm install -S 1528293"
Runtime.getRuntime().exec(command);

But I get the error “cat unknown option S “.

The same command works perfectly fine when I run it from adb shell.
Don’t know what I am doing wrong and could use some help.

EDIT 1:-
I tried running the command like below:-

String[] commandInstall = {
"/system/bin/sh",
"-c",
"cat /sdcard/Download/myfolder/newapp.apk | pm install -S 1528293"
};
Process process = Runtime.getRuntime().exec(commandInstall);

But now I get the error:-

ava.lang.SecurityException: Reverse mode only supported from shell
at com.android.server.pm.PackageInstallerSession.doWriteInternal(PackageInstallerSession.java:679)
at com.android.server.pm.PackageInstallerSession.write(PackageInstallerSession.java:612)
at android.content.pm.PackageInstaller$Session.write(PackageInstaller.java:852)
at com.android.server.pm.PackageManagerShellCommand.doWriteSplit(PackageManagerShellCommand.java:2447)
at com.android.server.pm.PackageManagerShellCommand.runInstall(PackageManagerShellCommand.java:915)
at com.android.server.pm.PackageManagerShellCommand.onCommand(PackageManagerShellCommand.java:158)
at android.os.ShellCommand.exec(ShellCommand.java:103)
at com.android.server.pm.PackageManagerService.onShellCommand(PackageManagerService.java:21330)
at android.os.Binder.shellCommand(Binder.java:634)
at android.os.Binder.onTransact(Binder.java:532)
at android.content.pm.IPackageManager$Stub.onTransact(IPackageManager.java:2821)
at com.android.server.pm.PackageManagerService.onTransact(PackageManagerService.java:3856)
at android.os.Binder.execTransact(Binder.java:731)

Edit 2:- Prior to android 9, I could just do the below for installing apps:-

Runtime.getRuntime().exec("pm install -r app.apk");