diff --git a/jacodb-core/src/main/kotlin/org/jacodb/impl/fs/Jars.kt b/jacodb-core/src/main/kotlin/org/jacodb/impl/fs/Jars.kt
index 258a9782e..ab04546fa 100644
--- a/jacodb-core/src/main/kotlin/org/jacodb/impl/fs/Jars.kt
+++ b/jacodb-core/src/main/kotlin/org/jacodb/impl/fs/Jars.kt
@@ -17,6 +17,7 @@
 package org.jacodb.impl.fs
 
 import jetbrains.exodus.util.LightByteArrayOutputStream
+import org.jacodb.impl.util.asSequence
 import java.io.InputStream
 import java.io.OutputStream
 import java.util.jar.Attributes
@@ -43,9 +44,9 @@ class JarFacade(private val runtimeVersion: Int, private val getter: () -> JarFi
         getter().use { jarFile ->
             isJmod = jarFile?.name?.endsWith(".jmod") ?: false
             isMultiReleaseEnabledInManifest = jarFile?.manifest?.mainAttributes?.getValue(MULTI_RELEASE).toBoolean()
-            entries = jarFile?.entries()?.toList()?.filter {
+            entries = jarFile?.entries()?.asSequence()?.filter {
                 it.name.endsWith(".class") && !it.name.contains("module-info")
-            }?.associateBy { it.name }
+            }?.associate { it.name to JarEntry(it) }
         }
     }
 
@@ -85,8 +86,8 @@ class JarFacade(private val runtimeVersion: Int, private val getter: () -> JarFi
             val jarFile = getter() ?: return emptyMap()
             return jarFile.use {
                 val buffer = ByteArray(DEFAULT_BUFFER_SIZE * 8)
-                classes.map { it.key to jarFile.getInputStream(it.value).use { it.readBytes(buffer) } }
-            }.toMap()
+                classes.entries.associate { it.key to jarFile.getInputStream(it.value).use { it.readBytes(buffer) } }
+            }
         }
 
 }
diff --git a/jacodb-core/src/main/kotlin/org/jacodb/impl/util/SequenceUtil.kt b/jacodb-core/src/main/kotlin/org/jacodb/impl/util/SequenceUtil.kt
index e148c4f12..6a6fbe015 100644
--- a/jacodb-core/src/main/kotlin/org/jacodb/impl/util/SequenceUtil.kt
+++ b/jacodb-core/src/main/kotlin/org/jacodb/impl/util/SequenceUtil.kt
@@ -16,6 +16,18 @@
 
 package org.jacodb.impl.util
 
+import java.util.*
+
 inline fun <T> Sequence(crossinline it: () -> Iterable<T>): Sequence<T> = object : Sequence<T> {
     override fun iterator(): Iterator<T> = it().iterator()
+}
+
+fun <T> Enumeration<T>?.asSequence(): Sequence<T> {
+    if (this == null) return emptySequence()
+    return object : Sequence<T> {
+        override fun iterator(): Iterator<T> = object : Iterator<T> {
+            override fun hasNext() = this@asSequence.hasMoreElements()
+            override fun next(): T = this@asSequence.nextElement()
+        }
+    }
 }
\ No newline at end of file
diff --git a/jacodb-core/src/test/kotlin/org/jacodb/testing/JarFacadeTest.kt b/jacodb-core/src/test/kotlin/org/jacodb/testing/JarFacadeTest.kt
index 97b1f0f95..708f299da 100644
--- a/jacodb-core/src/test/kotlin/org/jacodb/testing/JarFacadeTest.kt
+++ b/jacodb-core/src/test/kotlin/org/jacodb/testing/JarFacadeTest.kt
@@ -16,9 +16,14 @@
 
 package org.jacodb.testing
 
+import kotlinx.coroutines.runBlocking
+import org.jacodb.impl.JcRamErsSettings
 import org.jacodb.impl.fs.JarFacade
 import org.jacodb.impl.fs.parseRuntimeVersion
-import org.junit.jupiter.api.Assertions.*
+import org.jacodb.impl.jacodb
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Assertions.assertNotNull
+import org.junit.jupiter.api.Assertions.assertTrue
 import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.condition.EnabledOnJre
 import org.junit.jupiter.api.condition.JRE
@@ -93,4 +98,15 @@ class JarFacadeTest {
         assertTrue(javaBase.classes.contains("java.lang.String"))
         assertNotNull(javaBase.inputStreamOf("java.lang.String"))
     }
+
+    @Test
+    fun `load bouncycastle`(): Unit = runBlocking {
+        val jar = cookJar("https://repo1.maven.org/maven2/org/bouncycastle/bcpg-jdk18on/1.78.1/bcpg-jdk18on-1.78.1.jar")
+        val db = jacodb {
+            persistenceImpl(JcRamErsSettings)
+            loadByteCode(listOf(jar.toFile()))
+        }.apply { awaitBackgroundJobs() }
+        val cp = db.classpath(listOf(jar.toFile()))
+        assertTrue(cp.locations.flatMap { location -> location.classes.values }.isNotEmpty())
+    }
 }
\ No newline at end of file
diff --git a/jacodb-core/src/test/kotlin/org/jacodb/testing/persistence/incrementality/IncrementalDbTest.kt b/jacodb-core/src/test/kotlin/org/jacodb/testing/persistence/incrementality/IncrementalDbTest.kt
index fcffc76a5..4299dd01c 100644
--- a/jacodb-core/src/test/kotlin/org/jacodb/testing/persistence/incrementality/IncrementalDbTest.kt
+++ b/jacodb-core/src/test/kotlin/org/jacodb/testing/persistence/incrementality/IncrementalDbTest.kt
@@ -19,15 +19,12 @@ package org.jacodb.testing.persistence.incrementality
 import kotlinx.coroutines.runBlocking
 import org.jacodb.api.jvm.ext.findClass
 import org.jacodb.testing.WithDb
+import org.jacodb.testing.cookJar
+import org.jacodb.testing.createTempJar
 import org.junit.jupiter.api.Assertions
 import org.junit.jupiter.api.Test
-import java.net.URL
 import java.nio.file.Files
-import java.nio.file.Files.createDirectories
-import java.nio.file.Path
 import java.nio.file.StandardCopyOption
-import kotlin.io.path.Path
-import kotlin.io.path.createTempDirectory
 
 class IncrementalDbTest {
 
@@ -55,16 +52,4 @@ class IncrementalDbTest {
         db.awaitBackgroundJobs()
         Assertions.assertTrue(bc1 contentEquals cp.findClass("com.github.penemue.keap.PriorityQueue").bytecode())
     }
-
-    private fun cookJar(link: String): Path {
-        val url = URL(link)
-        val result = createTempJar(url.file)
-        Files.copy(url.openStream(), result, StandardCopyOption.REPLACE_EXISTING)
-        return result
-    }
-
-    private fun createTempJar(name: String) =
-        Path(createTempDirectory("jcdb-temp-jar").toString(), name).also {
-            createDirectories(it.parent)
-        }
 }
\ No newline at end of file
diff --git a/jacodb-core/src/testFixtures/kotlin/org/jacodb/testing/Jars.kt b/jacodb-core/src/testFixtures/kotlin/org/jacodb/testing/Jars.kt
new file mode 100644
index 000000000..69e891b64
--- /dev/null
+++ b/jacodb-core/src/testFixtures/kotlin/org/jacodb/testing/Jars.kt
@@ -0,0 +1,37 @@
+/*
+ *  Copyright 2022 UnitTestBot contributors (utbot.org)
+ * <p>
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ * <p>
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+package org.jacodb.testing
+
+import java.net.URL
+import java.nio.file.Files
+import java.nio.file.Files.createDirectories
+import java.nio.file.Path
+import java.nio.file.StandardCopyOption
+import kotlin.io.path.Path
+import kotlin.io.path.createTempDirectory
+
+fun cookJar(link: String): Path {
+    val url = URL(link)
+    val result = createTempJar(url.file)
+    Files.copy(url.openStream(), result, StandardCopyOption.REPLACE_EXISTING)
+    return result
+}
+
+fun createTempJar(name: String) =
+    Path(createTempDirectory("jcdb-temp-jar").toString(), name).also {
+        createDirectories(it.parent)
+    }
\ No newline at end of file