Why does Runtime.getRuntime.exec throw error=13, Permission denied?

Question

Java

I'm running under debian 10.

java.io.IOException: Cannot run program "/usr/bin/cat": error=13, Permission denied
  at java.base/java.lang.ProcessBuilder.start(ProcessBuilder.java:1128) ~[na:na]
  at java.base/java.lang.ProcessBuilder.start(ProcessBuilder.java:1071) ~[na:na]
  at java.base/java.lang.Runtime.exec(Runtime.java:590) ~[na:na]
  at java.base/java.lang.Runtime.exec(Runtime.java:414) ~[na:na]
  at java.base/java.lang.Runtime.exec(Runtime.java:311) ~[na:na]

java is launched under root, /usr/bin/cat is launched under the same user, /usr/bin/ping and others are also not launched from under java, but are launched from the console,

setenforce 0

did not give anything

python -c "import os; os.system('/usr/bin/ping 8.8.8.8')" - works, not from java

Answer 1

in general, I rearranged the toad, it worked